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1

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Left- or right-handed C-H bond activation (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-02-16

Keywords: Chemistry

Print ISSN: 0036-8075

Electronic ISSN: 1095-9203

Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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Comment on "Selective anaerobic oxidation of methane enables direct synthesis of methanol" (2018)

Labinger, J. A.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-02-16

Description: The comment and response concerning the report of oxidation of methane to methanol by water (Reports, 5 May 2017, p. 523) do not fully capture the implications of thermodynamic limitations. A nonisothermal process in which each cycle requires a large temperature swing and permits only substoichiometric methane conversion surely could not be carried out on any practical scale.

Keywords: Chemistry

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Response to Comment on "Selective anaerobic oxidation of methane enables direct synthesis of methanol" (2018)

Sushkevich, V. L., Palagin, D., Ranocchiari, M., van Bokhoven, J. A.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-02-16

Description: Labinger argues that stepwise reaction of methane with water to produce methanol and hydrogen will never be commercially feasible because of its substoichiometric basis with respect to the active site and the requirement of a large temperature swing. This comment is not touching any new ground, beyond describing the thermodynamic feasibility, thermal cycling, and the role of water as discussed previously. Most important, it does not have a solid numerical basis.

Keywords: Chemistry

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Silicon smooths the way to vinyl cations (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-07-27

Keywords: Chemistry

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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Teaching an old carbocation new tricks: Intermolecular C-H insertion reactions of vinyl cations (2018)

Popov, S., Shao, B., Bagdasarian, A. L., Benton, T. R., Zou, L., Yang, Z., Houk, K. N., Nelson, H. M.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-07-27

Description: Vinyl carbocations have been the subject of extensive experimental and theoretical studies over the past five decades. Despite this long history in chemistry, the utility of vinyl cations in chemical synthesis has been limited, with most reactivity studies focusing on solvolysis reactions or intramolecular processes. Here we report synthetic and mechanistic studies of vinyl cations generated through silylium–weakly coordinating anion catalysis. We find that these reactive intermediates undergo mild intermolecular carbon-carbon bond–forming reactions, including carbon-hydrogen (C–H) insertion into unactivated sp 3 C–H bonds and reductive Friedel-Crafts reactions with arenes. Moreover, we conducted computational studies of these alkane C–H functionalization reactions and discovered that they proceed through nonclassical, ambimodal transition structures. This reaction manifold provides a framework for the catalytic functionalization of hydrocarbons using simple ketone derivatives.

Keywords: Chemistry

Print ISSN: 0036-8075

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Empirical pseudopotential method with nonspherical passivants for the atomistic study of silicon nanostructures (2018)

J. R. Cárdenas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-31

Description: Author(s): J. R. Cárdenas Atomistic calculations of passivated nanostructures remain difficult due to the computational demands related to the high number of atoms to be typically considered. The empirical pseudopotential method (EPM) offers a good alternative in this sense, but finding trustable pseudopotentials for passiva... [Phys. Rev. B 98, 045308] Published Mon Jul 30, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

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7

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Berry phase of the composite-fermion Fermi sea: Effect of Landau-level mixing (2018)

Songyang Pu, Mikael Fremling, and J. K. Jain

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-04

Description: Author(s): Songyang Pu, Mikael Fremling, and J. K. Jain We construct explicit lowest-Landau-level wave functions for the composite-fermion Fermi sea and its low-energy excitations following a recently developed approach [Pu, Wu, and Jain, Phys. Rev. B 96 , 195302 (2017) ] and demonstrate them to be very accurate representations of the Coulomb eigenstates. ... [Phys. Rev. B 98, 075304] Published Fri Aug 03, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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8

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Coupled wire model of ${Z}_{4}$ orbifold quantum Hall states (2018)

Charles L. Kane and Ady Stern

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-07

Description: Author(s): Charles L. Kane and Ady Stern We introduce a coupled wire model for a sequence of non-Abelian quantum Hall states that generalize the Z 4 parafermion Read-Rezayi state. The Z 4 orbifold quantum Hall states occur at filling factors ν = 2 / ( 2 m − p ) for odd integers m and p , and have a topological order with a neutral sector characterized... [Phys. Rev. B 98, 085302] Published Mon Aug 06, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Current-induced spin polarization in the isotropic $k$-cubed Rashba model: Theoretical study of $p$-doped semiconductor heterostructures and perovskite-oxide interfaces (2018)

Ł. Karwacki, A. Dyrdał, J. Berakdar, and J. Barnaś

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-05

Description: Author(s): Ł. Karwacki, A. Dyrdał, J. Berakdar, and J. Barnaś Using the Matsubara Green's function formalism, we calculate the temperature dependence of the nonequilibrium spin polarization induced by an external electric field in the presence of spin-orbit coupling. The model Hamiltonian includes an isotropic k -cubed form of the Rashba spin-orbit interaction.... [Phys. Rev. B 97, 235302] Published Mon Jun 04, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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10

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Positronium formation at Si surfaces (2018)

A. Kawasuso, M. Maekawa, A. Miyashita, K. Wada, T. Kaiwa, and Y. Nagashima

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-06

Description: Author(s): A. Kawasuso, M. Maekawa, A. Miyashita, K. Wada, T. Kaiwa, and Y. Nagashima Positronium formation at Si(111) and Si(001) surfaces has been investigated by changing the doping level systematically over the range 300–1000 K. The temperature dependence of the positronium fraction varied with the doping condition, and there were practically no differences between the two surfac... [Phys. Rev. B 97, 245303] Published Tue Jun 05, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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11

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Separation of enantiomers by their enantiospecific interaction with achiral magnetic substrates (2018)

Banerjee-Ghosh, K., Ben Dor, O., Tassinari, F., Capua, E., Yochelis, S., Capua, A., Yang, S.-H., Parkin, S. S. P., Sarkar, S., Kronik, L., Baczewski, L. T., Naaman, R., Paltiel, Y.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-06-22

Description: It is commonly assumed that recognition and discrimination of chirality, both in nature and in artificial systems, depend solely on spatial effects. However, recent studies have suggested that charge redistribution in chiral molecules manifests an enantiospecific preference in electron spin orientation. We therefore reasoned that the induced spin polarization may affect enantiorecognition through exchange interactions. Here we show experimentally that the interaction of chiral molecules with a perpendicularly magnetized substrate is enantiospecific. Thus, one enantiomer adsorbs preferentially when the magnetic dipole is pointing up, whereas the other adsorbs faster for the opposite alignment of the magnetization. The interaction is not controlled by the magnetic field per se, but rather by the electron spin orientations, and opens prospects for a distinct approach to enantiomeric separations.

Keywords: Chemistry

Print ISSN: 0036-8075

Electronic ISSN: 1095-9203

Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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12

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Inspiration from a vitamin (2018)

Funk, M. A.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-06-29

Keywords: Chemistry

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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13

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Finite-wave-vector electromagnetic response in lattice quantum Hall systems (2018)

Fenner Harper, David Bauer, T. S. Jackson, and Rahul Roy

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-07

Description: Author(s): Fenner Harper, David Bauer, T. S. Jackson, and Rahul Roy In a quantum Hall system, the finite-wave-vector Hall conductivity displays an intriguing dependence on the Hall viscosity. Here, the authors study this connection for quantum Hall systems on a lattice and find that the neat continuum relation breaks down. In the process, they introduce a universal formalism for studying lattice quantum Hall systems and find that, in the low flux density limit, generic lattice wave functions connect smoothly to the Landau levels of the continuum. They also introduce a quantum mechanical method for calculating the electromagnetic response of such systems. [Phys. Rev. B 98, 245303] Published Thu Dec 06, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Spectroscopy and level detuning of few-electron spin states in parallel InAs quantum dots (2018)

Claes Thelander, Malin Nilsson, Florinda Viñas Boström, Adam Burke, Sebastian Lehmann, Kimberly A. Dick, and Martin Leijnse

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-11

Description: Author(s): Claes Thelander, Malin Nilsson, Florinda Viñas Boström, Adam Burke, Sebastian Lehmann, Kimberly A. Dick, and Martin Leijnse We use tunneling spectroscopy to study the evolution of few-electron spin states in parallel InAs nanowire double quantum dots (QDs) as a function of level detuning and applied magnetic field. Compared to the much more studied serial configuration, parallel coupling of the QDs to source and drain gr... [Phys. Rev. B 98, 245305] Published Mon Dec 10, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Observation of the geometric phase effect in the H + HD -〉 H2 + D reaction (2018)

Yuan, D., Guan, Y., Chen, W., Zhao, H., Yu, S., Luo, C., Tan, Y., Xie, T., Wang, X., Sun, Z., Zhang, D. H., Yang, X.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-12-14

Description: Theory has established the importance of geometric phase (GP) effects in the adiabatic dynamics of molecular systems with a conical intersection connecting the ground- and excited-state potential energy surfaces, but direct observation of their manifestation in chemical reactions remains a major challenge. Here, we report a high-resolution crossed molecular beams study of the H + HD -〉 H 2 + D reaction at a collision energy slightly above the conical intersection. Velocity map ion imaging revealed fast angular oscillations in product quantum state–resolved differential cross sections in the forward scattering direction for H 2 products at specific rovibrational levels. The experimental results agree with adiabatic quantum dynamical calculations only when the GP effect is included.

Keywords: Chemistry

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16

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Electron spin noise under the conditions of nuclei-induced frequency focusing (2018)

Natalie Jäschke, Frithjof B. Anders, and Mikhail M. Glazov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): Natalie Jäschke, Frithjof B. Anders, and Mikhail M. Glazov We study theoretically the electron spin noise in quantum dots under nonequilibrium conditions caused by the pumping by a train of circularly polarized optical pulses. In such a situation, the nuclear spins are known to adjust in such a way that the electron spin precession frequencies become multip... [Phys. Rev. B 98, 045307] Published Tue Jul 24, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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17

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Single-beam optical measurement of spin dynamics in CdTe/(Cd,Mg)Te quantum wells (2018)

F. Saeed, M. Kuhnert, I. A. Akimov, V. L. Korenev, G. Karczewski, M. Wiater, T. Wojtowicz, A. Ali, A. S. Bhatti, D. R. Yakovlev, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): F. Saeed, M. Kuhnert, I. A. Akimov, V. L. Korenev, G. Karczewski, M. Wiater, T. Wojtowicz, A. Ali, A. S. Bhatti, D. R. Yakovlev, and M. Bayer We study optical pumping of resident electron spins under resonant excitation of trions in n -type CdTe/(Cd,Mg)Te quantum wells subject to a transverse magnetic field. In contrast to the comprehensively used time-resolved pump-probe techniques with polarimetric detection, we exploit here a single bea... [Phys. Rev. B 98, 075308] Published Mon Aug 13, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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18

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Decay and revival of electron spin polarization in an ensemble of (In,Ga)As quantum dots (2018)

E. Evers, V. V. Belykh, N. E. Kopteva, I. A. Yugova, A. Greilich, D. R. Yakovlev, D. Reuter, A. D. Wieck, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): E. Evers, V. V. Belykh, N. E. Kopteva, I. A. Yugova, A. Greilich, D. R. Yakovlev, D. Reuter, A. D. Wieck, and M. Bayer The periodic optical orientation of electron spins in (In,Ga)As/GaAs quantum dots leads to the formation of electron spin precession modes about an external magnetic field which are resonant with the pumping periodicity. As the electron spin is localized within a nuclear spin bath, its polarization ... [Phys. Rev. B 98, 075309] Published Wed Aug 15, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Photocatalytic upgrading of natural gas (2018)

Kanai, M.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-08-17

Keywords: Chemistry

Print ISSN: 0036-8075

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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Radically transforming light hydrocarbons (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-08-17

Keywords: Chemistry

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Stereodivergent synthesis of 1,4-dicarbonyls by traceless charge-accelerated sulfonium rearrangement (2018)

Kaldre, D., Klose, I., Maulide, N.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-08-17

Description: The chemistry of the carbonyl group is essential to modern organic synthesis. The preparation of substituted, enantioenriched 1,3- or 1,5-dicarbonyls is well developed, as their disconnection naturally follows from the intrinsic polarity of the carbonyl group. By contrast, a general enantioselective access to quaternary stereocenters in acyclic 1,4-dicarbonyl systems remains an unresolved problem, despite the tremendous importance of 2,3-substituted 1,4-dicarbonyl motifs in natural products and drug scaffolds. Here we present a broad enantioselective and stereodivergent strategy to access acyclic, polysubstituted 1,4-dicarbonyls via acid-catalyzed [3,3]-sulfonium rearrangement starting from vinyl sulfoxides and ynamides. The stereochemistry at sulfur governs the absolute sense of chiral induction, whereas the double bond geometry dictates the relative configuration of the final products.

Keywords: Chemistry

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Four varieties of carbonyl sandwich (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-08-17

Keywords: Chemistry

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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Selective functionalization of methane, ethane, and higher alkanes by cerium photocatalysis (2018)

Hu, A., Guo, J.-J., Pan, H., Zuo, Z.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-08-17

Description: With the recent soaring production of natural gas, the use of methane and other light hydrocarbon feedstocks as starting materials in synthetic transformations is becoming increasingly economically attractive, although it remains chemically challenging. We report the development of photocatalytic C–H amination, alkylation, and arylation of methane, ethane, and higher alkanes under visible light irradiation at ambient temperature. High catalytic efficiency (turnover numbers up to 2900 for methane and 9700 for ethane) and selectivity were achieved using abundant, inexpensive cerium salts as photocatalysts. Ligand-to-metal charge transfer excitation generated alkoxy radicals from simple alcohols that in turn acted as hydrogen atom transfer catalysts. The mixed-phase gas/liquid reaction was adapted to continuous flow, enabling the efficient use of gaseous feedstocks in scalable photocatalytic transformations.

Keywords: Chemistry

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24

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Dynamical signature of the moiré pattern in a non-Hermitian ladder (2018)

X. M. Yang, X. Z. Zhang, C. Li, and Z. Song

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-18

Description: Author(s): X. M. Yang, X. Z. Zhang, C. Li, and Z. Song We study the dynamical behavior of a non-Hermitian moire superlattice system, which consists of two-coupled Su-Schrieffer-Heeger (SSH) chains with staggered imaginary on-site potentials. The slight difference, which indicates that the in-lattice spacing of nearest-neighbor lattice sites at the top i... [Phys. Rev. B 98, 085306] Published Fri Aug 17, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Large negative magnetoresistance driven by enhanced weak localization and Kondo effect at the interface of $\mathrm{LaAl}{\mathrm{O}}_{3}$ and Fe-doped $\mathrm{SrTi}{\mathrm{O}}_{3}$ (2018)

Hongxia Xue, Yanpeng Hong, Chengjian Li, Jianchao Meng, Yongchun Li, Kejian Liu, Mingrui Liu, Weimin Jiang, Zhe Zhang, Lin He, Ruifen Dou, Changmin Xiong, and Jiacai Nie

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-18

Description: Author(s): Hongxia Xue, Yanpeng Hong, Chengjian Li, Jianchao Meng, Yongchun Li, Kejian Liu, Mingrui Liu, Weimin Jiang, Zhe Zhang, Lin He, Ruifen Dou, Changmin Xiong, and Jiacai Nie The out-of-plane magnetoresistance of a LaAl O 3 / SrTi O 3 interface is commonly positive due to significant orbital effect. In this paper, a large negative magnetoresistance is observed at a LaAl O 3 and Fe-doped SrTi O 3 interface upon the application of an out-of-plane magnetic field. Such large negative ... [Phys. Rev. B 98, 085305] Published Fri Aug 17, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Hot lithium-oxygen batteries charge ahead (2018)

Feng, S., Lunger, J. R., Johnson, J. A., Shao-Horn, Y.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-08-24

Keywords: Chemistry

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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A preference for acids (2018)

Szuromi, P.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-08-24

Keywords: Chemistry

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Robust electric dipole transition at microwave frequencies for nuclear spin qubits in silicon (2018)

Guilherme Tosi, Fahd A. Mohiyaddin, Stefanie Tenberg, Arne Laucht, and Andrea Morello

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-31

Description: Author(s): Guilherme Tosi, Fahd A. Mohiyaddin, Stefanie Tenberg, Arne Laucht, and Andrea Morello The nuclear spin state of a phosphorus donor ( P 31 ) in isotopically enriched silicon-28 is an excellent host to store quantum information in the solid state. The spin's insensitivity to electric fields yields a solid-state qubit with record coherence times but also renders coupling to other quantum s... [Phys. Rev. B 98, 075313] Published Thu Aug 30, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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18 electrons and counting (2018)

Armentrout, P. B.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-08-31

Keywords: Chemistry

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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Directional control of a processive molecular hopper (2018)

Qing, Y., Ionescu, S. A., Pulcu, G. S., Bayley, H.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-08-31

Description: Intrigued by the potential of nanoscale machines, scientists have long attempted to control molecular motion. We monitored the individual 0.7-nanometer steps of a single molecular hopper as it moved in an electric field along a track in a nanopore controlled by a chemical ratchet. The hopper demonstrated characteristics desired in a moving molecule: defined start and end points, processivity, no chemical fuel requirement, directional motion, and external control. The hopper was readily functionalized to carry cargos. For example, a DNA molecule could be ratcheted along the track in either direction, a prerequisite for nanopore sequencing.

Keywords: Chemistry

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Quantum transport through pairs of edge states of opposite chirality at electric and magnetic boundaries (2018)

Puja Mondal, Alain Nogaret, and Sankalpa Ghosh

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-12

Description: Author(s): Puja Mondal, Alain Nogaret, and Sankalpa Ghosh We theoretically investigate electrical transport in a two-dimensional electron system hosting bulk and edge current carrying states. Spatially varying magnetic and electric confinement creates pairs of current carrying lines that drift in the same or opposite directions depending on whether confine... [Phys. Rev. B 98, 125303] Published Tue Sep 11, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Spin inertia of resident and photoexcited carriers in singly charged quantum dots (2018)

E. A. Zhukov, E. Kirstein, D. S. Smirnov, D. R. Yakovlev, M. M. Glazov, D. Reuter, A. D. Wieck, M. Bayer, and A. Greilich

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-15

Description: Author(s): E. A. Zhukov, E. Kirstein, D. S. Smirnov, D. R. Yakovlev, M. M. Glazov, D. Reuter, A. D. Wieck, M. Bayer, and A. Greilich The spin dynamics in a broad range of systems can be studied using circularly polarized optical excitation with alternating helicity. The dependence of spin polarization on the frequency of helicity alternation, known as the spin inertia effect, is used here to study the spin dynamics in singly char... [Phys. Rev. B 98, 121304(R)] Published Fri Sep 14, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Correlation between spin transport signal and Heusler/semiconductor interface quality in lateral spin-valve devices (2018)

B. Kuerbanjiang, Y. Fujita, M. Yamada, S. Yamada, A. M. Sanchez, P. J. Hasnip, A. Ghasemi, D. Kepaptsoglou, G. Bell, K. Sawano, K. Hamaya, and V. K. Lazarov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-18

Description: Author(s): B. Kuerbanjiang, Y. Fujita, M. Yamada, S. Yamada, A. M. Sanchez, P. J. Hasnip, A. Ghasemi, D. Kepaptsoglou, G. Bell, K. Sawano, K. Hamaya, and V. K. Lazarov We show direct evidence for the impact of Heusler/semiconductor interfaces atomic structure on the spin transport signals in semiconductor-based lateral spin-valve (LSV) devices. Based on atomic scale Z-contrast scanning transmission electron microscopy and energy dispersive x-ray spectroscopy we sh... [Phys. Rev. B 98, 115304] Published Mon Sep 17, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Effect of density on microwave-induced resistance oscillations in back-gated GaAs quantum wells (2018)

X. Fu, M. D. Borisov, M. A. Zudov, Q. Qian, J. D. Watson, and M. J. Manfra

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-18

Description: Author(s): X. Fu, M. D. Borisov, M. A. Zudov, Q. Qian, J. D. Watson, and M. J. Manfra We report on microwave-induced resistance oscillations (MIROs) in a tunable-density 30-nm-wide GaAs/AlGaAs quantum well. We find that the MIRO amplitude increases dramatically with carrier density. Our analysis shows that the anticipated increase in the effective microwave power and quantum lifetime... [Phys. Rev. B 98, 121303(R)] Published Mon Sep 17, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Unlocking P(V): Reagents for chiral phosphorothioate synthesis (2018)

Knouse, K. W., de; Gruyter, J. N., Schmidt, M. A., Zheng, B., Vantourout, J. C., Kingston, C., Mercer, S. E., Mcdonald, I. M., Olson, R. E., Zhu, Y., Hang, C., Zhu, J., Yuan, C., Wang, Q., Park, P., Eastgate, M. D., Baran, P. S.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-09-21

Description: Phosphorothioate nucleotides have emerged as powerful pharmacological substitutes of their native phosphodiester analogs with important translational applications in antisense oligonucleotide (ASO) therapeutics and cyclic dinucleotide (CDN) synthesis. Stereocontrolled installation of this chiral motif has long been hampered by the systemic use of phosphorus(III) [P(III)]–based reagent systems as the sole practical means of oligonucleotide assembly. A fundamentally different approach is described herein: the invention of a P(V)-based reagent platform for programmable, traceless, diastereoselective phosphorus-sulfur incorporation. The power of this reagent system is demonstrated through the robust and stereocontrolled synthesis of various nucleotidic architectures, including ASOs and CDNs, via an efficient, inexpensive, and operationally simple protocol.

Keywords: Chemistry

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Self-assembly of lattices with high structural complexity from a geometrically simple molecule (2018)

Yamagishi, H., Sato, H., Hori, A., Sato, Y., Matsuda, R., Kato, K., Aida, T.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-09-21

Description: Here we report an anomalous porous molecular crystal built of C–H···N-bonded double-layered roof-floor components and wall components of a segregatively interdigitated architecture. This complicated porous structure consists of only one type of fully aromatic multijoint molecule carrying three identical dipyridylphenyl wedges. Despite its high symmetry, this molecule accomplishes difficult tasks by using two of its three wedges for roof-floor formation and using its other wedge for wall formation. Although a C–H···N bond is extremely labile, the porous crystal maintains its porosity until thermal breakdown of the C–H···N bonds at 202°C occurs, affording a nonporous polymorph. Though this nonporous crystal survives even at 325°C, it can retrieve the parent porosity under acetonitrile vapor. These findings show how one can translate simplicity into ultrahigh complexity.

Keywords: Chemistry

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Effect of chaos on two-dimensional spin transport (2018)

Chen-Rong Liu, Xian-Zhang Chen, Hong-Ya Xu, Liang Huang, and Ying-Cheng Lai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-25

Description: Author(s): Chen-Rong Liu, Xian-Zhang Chen, Hong-Ya Xu, Liang Huang, and Ying-Cheng Lai The role of classical dynamics in spin transport is an intriguing problem from the point of view of classical-quantum correspondence, as spin is a purely relativistic quantum mechanical variable with no classical counterpart. Nevertheless, due to spin-orbit coupling (generally referred to as the rel... [Phys. Rev. B 98, 115305] Published Mon Sep 24, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Tunable quantum Hall edge conduction in bilayer graphene through spin-orbit interaction (2018)

Jun Yong Khoo and Leonid Levitov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-27

Description: Author(s): Jun Yong Khoo and Leonid Levitov Bilayer graphene, in the presence of a one-sided spin-orbit interaction (SOI) induced by a suitably chosen substrate, is predicted to exhibit unconventional quantum Hall states. The new states arise due to strong SOI-induced splittings of the eight zeroth Landau levels, which are strongly layer pola... [Phys. Rev. B 98, 115307] Published Wed Sep 26, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Two ways out of an oxetane (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-09-28

Keywords: Chemistry

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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Arenes and amides from a single source (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-09-28

Keywords: Chemistry

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Interrupted carbonyl-olefin metathesis via oxygen atom transfer (2018)

Ludwig, J. R., Watson, R. B., Nasrallah, D. J., Gianino, J. B., Zimmerman, P. M., Wiscons, R. A., Schindler, C. S.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-09-28

Description: Some of the simplest and most powerful carbon-carbon bond forming strategies take advantage of readily accessible ubiquitous motifs: carbonyls and olefins. Here we report a fundamentally distinct mode of reactivity between carbonyls and olefins that differs from established acid-catalyzed carbonyl-ene, Prins, and carbonyl-olefin metathesis reaction paths. A range of epsilon, zeta-unsaturated ketones undergo Brønsted acid–catalyzed intramolecular cyclization to provide tetrahydrofluorene products via the formation of two new carbon-carbon bonds. Theoretical calculations and accompanying mechanistic studies suggest that this carbocyclization reaction proceeds through the intermediacy of a transient oxetane formed by oxygen atom transfer. The complex polycyclic frameworks in this product class appear as common substructures in organic materials, bioactive natural products, and recently developed pharmaceuticals.

Keywords: Chemistry

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Arylsulfonylacetamides as bifunctional reagents for alkene aminoarylation (2018)

Monos, T. M., McAtee, R. C., Stephenson, C. R. J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-09-28

Description: Alkene aminoarylation with a single, bifunctional reagent is a concise synthetic strategy. We report a catalytic protocol for the addition of arylsulfonylacetamides across electron-rich alkenes with complete anti-Markovnikov regioselectivity and excellent diastereoselectivity to provide 2,2-diarylethylamines. In this process, single-electron alkene oxidation enables carbon-nitrogen bond formation to provide a key benzylic radical poised for a Smiles-Truce 1,5-aryl shift. This reaction is redox-neutral, exhibits broad functional group compatibility, and occurs at room temperature with loss of sulfur dioxide. As this process is driven by visible light, uses readily available starting materials, and demonstrates convergent synthesis, it is well suited for use in a variety of synthetic endeavors.

Keywords: Chemistry

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Imaging spin-resolved cyclotron trajectories in the InSb two-dimensional electron gas (2018)

A. Mreńca-Kolasińska, K. Kolasiński, and B. Szafran

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-29

Description: Author(s): A. Mreńca-Kolasińska, K. Kolasiński, and B. Szafran We consider spin-resolved cyclotron trajectories in a magnetic focusing device with quantum point source and drain contacts defined within the InSb two-dimensional electron gas and their mapping by the scanning gate microscopy. Besides the perpendicular component of the external magnetic field which... [Phys. Rev. B 98, 115309] Published Fri Sep 28, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Recombination from polar InGaN/GaN quantum well structures at high excitation carrier densities (2018)

G. M. Christian, S. Schulz, M. J. Kappers, C. J. Humphreys, R. A. Oliver, and P. Dawson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-03

Description: Author(s): G. M. Christian, S. Schulz, M. J. Kappers, C. J. Humphreys, R. A. Oliver, and P. Dawson In this paper we report on the emergence of a high energy band at high optically excited carrier densities in the low temperature photoluminescence spectra from polar InGaN/GaN single quantum well structures. This high energy band emerges at carrier densities when the emission from the localized gro... [Phys. Rev. B 98, 155301] Published Tue Oct 02, 2018

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A. V. Shumilin, D. S. Smirnov, and L. E. Golub

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-06

Description: Author(s): A. V. Shumilin, D. S. Smirnov, and L. E. Golub The spin relaxation time of localized charge carriers is a few orders of magnitude larger than that of free electrons and holes. Therefore, mutual conversion of spin polarization, charge current, and spin current turns out to be underlined in the hopping conductivity regime. We reveal different regi... [Phys. Rev. B 98, 155304] Published Fri Oct 05, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Activating plasmonic chemistry (2018)

Cortes, E.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-05

Keywords: Chemistry

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Hot carriers reducing thermal barriers (2018)

Szuromi, P.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-05

Keywords: Chemistry

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Quantifying hot carrier and thermal contributions in plasmonic photocatalysis (2018)

Zhou, L., Swearer, D. F., Zhang, C., Robatjazi, H., Zhao, H., Henderson, L., Dong, L., Christopher, P., Carter, E. A., Nordlander, P., Halas, N. J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-05

Description: Photocatalysis based on optically active, "plasmonic" metal nanoparticles has emerged as a promising approach to facilitate light-driven chemical conversions under far milder conditions than thermal catalysis. However, an understanding of the relation between thermal and electronic excitations has been lacking. We report the substantial light-induced reduction of the thermal activation barrier for ammonia decomposition on a plasmonic photocatalyst. We introduce the concept of a light-dependent activation barrier to account for the effect of light illumination on electronic and thermal excitations in a single unified picture. This framework provides insight into the specific role of hot carriers in plasmon-mediated photochemistry, which is critically important for designing energy-efficient plasmonic photocatalysts.

Keywords: Chemistry

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An acid inaccessible to aldol products (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-12

Keywords: Chemistry

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Iodine smooths the way to ketyl radicals (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-12

Keywords: Chemistry

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Ketyl radical reactivity via atom transfer catalysis (2018)

Wang, L., Lear, J. M., Rafferty, S. M., Fosu, S. C., Nagib, D. A.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-12

Description: Single-electron reduction of a carbonyl to a ketyl enables access to a polarity-reversed platform of reactivity for this cornerstone functional group. However, the synthetic utility of the ketyl radical is hindered by the strong reductants necessary for its generation, which also limit its reactivity to net reductive mechanisms. We report a strategy for net redox-neutral generation and reaction of ketyl radicals. The in situ conversion of aldehydes to α-acetoxy iodides lowers their reduction potential by more than 1 volt, allowing for milder access to the corresponding ketyl radicals and an oxidative termination event. Upon subjecting these iodides to a dimanganese decacarbonyl precatalyst and visible light irradiation, an atom transfer radical addition (ATRA) mechanism affords a broad scope of vinyl iodide products with high Z -selectivity.

Keywords: Chemistry

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Confined acids catalyze asymmetric single aldolizations of acetaldehyde enolates (2018)

Schreyer, L., Kaib, P. S. J., Wakchaure, V. N., Obradors, C., Properzi, R., Lee, S., List, B.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-12

Description: Reactions that form a product with the same reactive functionality as that of one of the starting compounds frequently end in oligomerization. As a salient example, selective aldol coupling of the smallest, though arguably most useful, enolizable aldehyde, acetaldehyde, with just one partner substrate has proven to be extremely challenging. Here, we report a highly enantioselective Mukaiyama aldol reaction with the simple triethylsilyl (TES) and tert -butyldimethylsilyl (TBS) enolates of acetaldehyde and various aliphatic and aromatic acceptor aldehydes. The reaction is catalyzed by recently developed, strongly acidic imidodiphosphorimidates (IDPi), which, like enzymes, display a confined active site but, like small-molecule catalysts, have a broad substrate scope. The process is scalable, fast, efficient (0.5 to 1.5 mole % catalyst loading), and greatly simplifies access to highly valuable silylated acetaldehyde aldols.

Keywords: Chemistry

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Tunneling blockade and single-photon emission in GaAs double quantum wells (2018)

M. Yuan, A. Hernández-Mínguez, K. Biermann, and P. V. Santos

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-13

Description: Author(s): M. Yuan, A. Hernández-Mínguez, K. Biermann, and P. V. Santos We report on the selective excitation of single impurity-bound exciton states in a GaAs double quantum well (DQW). The structure consists of two quantum wells (QWs) coupled by a thin tunnel barrier. The DQW is subject to a transverse electric field to create spatially indirect inter-QW excitons with... [Phys. Rev. B 98, 155311] Published Fri Oct 12, 2018

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Frequency feedback for two-photon interference from separate quantum dots (2018)

Michael Zopf, Tobias Macha, Robert Keil, Eduardo Uruñuela, Yan Chen, Wolfgang Alt, Lothar Ratschbacher, Fei Ding, Dieter Meschede, and Oliver G. Schmidt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-13

Description: Author(s): Michael Zopf, Tobias Macha, Robert Keil, Eduardo Uruñuela, Yan Chen, Wolfgang Alt, Lothar Ratschbacher, Fei Ding, Dieter Meschede, and Oliver G. Schmidt We employ active feedback to stabilize the frequency of single photons emitted by two separate quantum dots to an atomic standard. The transmission of a rubidium-based Faraday filter serves as the error signal for frequency stabilization. We achieve a residual frequency deviation of 〈 30 MHz, whic... [Phys. Rev. B 98, 161302(R)] Published Fri Oct 12, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Viscous transport and Hall viscosity in a two-dimensional electron system (2018)

G. M. Gusev, A. D. Levin, E. V. Levinson, and A. K. Bakarov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-16

Description: Author(s): G. M. Gusev, A. D. Levin, E. V. Levinson, and A. K. Bakarov Hall viscosity is a nondissipative response function describing momentum transport in two-dimensional (2D) systems with broken time-reversal symmetry. In the classical regime, Hall viscosity contributes to the viscous flow of 2D electrons in the presence of a magnetic field. We observe a pronounced,... [Phys. Rev. B 98, 161303(R)] Published Mon Oct 15, 2018

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Dynamic theory of nanophotonic control of two-dimensional semiconductor nonlinearities (2018)

S. Guazzotti, A. Pusch, D. E. Reiter, and O. Hess

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-18

Description: Author(s): S. Guazzotti, A. Pusch, D. E. Reiter, and O. Hess We introduce a Maxwell-Bloch simulation approach which self-consistently combines a microscopic description of the carrier and polarization dynamics of a transition-metal-dichalcogenide (TMDC) monolayer with a spatiotemporal full-wave time-domain simulation of Maxwell's equations on the basis of a f... [Phys. Rev. B 98, 245307] Published Mon Dec 17, 2018

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Polariton-enhanced exciton transport (2018)

D. M. Myers, S. Mukherjee, J. Beaumariage, D. W. Snoke, M. Steger, L. N. Pfeiffer, and K. West

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-20

Description: Author(s): D. M. Myers, S. Mukherjee, J. Beaumariage, D. W. Snoke, M. Steger, L. N. Pfeiffer, and K. West The transport distance of excitons in exciton-polariton systems has previously been assumed to be very small ( ≲ 1 μ m ). The sharp spatial profiles observed when generating polaritons by nonresonant optical excitation show that this assumption is generally true. In this paper, however, we show that the ... [Phys. Rev. B 98, 235302] Published Wed Dec 19, 2018

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Stark shift of excitons and trions in two-dimensional materials (2018)

L. S. R. Cavalcante, D. R. da Costa, G. A. Farias, D. R. Reichman, and A. Chaves

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-21

Description: Author(s): L. S. R. Cavalcante, D. R. da Costa, G. A. Farias, D. R. Reichman, and A. Chaves The effect of an external in-plane electric field on neutral and charged exciton states in two-dimensional (2D) materials is theoretically investigated. These states are argued to be strongly bound, so that electron-hole dissociation is not observed up to high electric field intensities. Trions in t... [Phys. Rev. B 98, 245309] Published Thu Dec 20, 2018

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Electric field modified Arrhenius description of charge transport in amorphous oxide semiconductor thin film transistors (2018)

Wei Wang, Guangwei Xu, M. Delwar H. Chowdhury, Hong Wang, Jae Kwang Um, Zhuoyu Ji, Nan Gao, Zhiwei Zong, Chong Bi, Congyan Lu, Nianduan Lu, Writam Banerjee, Jiafeng Feng, Ling Li, Andrey Kadashchuk, Jin Jang, and Ming Liu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-21

Description: Author(s): Wei Wang, Guangwei Xu, M. Delwar H. Chowdhury, Hong Wang, Jae Kwang Um, Zhuoyu Ji, Nan Gao, Zhiwei Zong, Chong Bi, Congyan Lu, Nianduan Lu, Writam Banerjee, Jiafeng Feng, Ling Li, Andrey Kadashchuk, Jin Jang, and Ming Liu While it is known that the charge-carrier mobility in amorphous metal oxide semiconductor thin film transistors (TFT) deviates from Arrhenius temperature dependence, we found that the Hall mobility measured in amorphous In-Ga-Zn-O (a-IGZO) follows an Arrhenius relation surprisingly well. We explain ... [Phys. Rev. B 98, 245308] Published Thu Dec 20, 2018

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Breaking through the nitrogen ceiling (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-12-21

Keywords: Chemistry

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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Magnetic hysteresis up to 80 kelvin in a dysprosium metallocene single-molecule magnet (2018)

Guo, F.-S., Day, B. M., Chen, Y.-C., Tong, M.-L., Mansikkamäki, A., Layfield, R. A.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-12-21

Description: Single-molecule magnets (SMMs) containing only one metal center may represent the lower size limit for molecule-based magnetic information storage materials. Their current drawback is that all SMMs require liquid-helium cooling to show magnetic memory effects. We now report a chemical strategy to access the dysprosium metallocene cation [(Cp i Pr5 )Dy(Cp*)] + (Cp i Pr5 , penta-iso-propylcyclopentadienyl; Cp *, pentamethylcyclopentadienyl), which displays magnetic hysteresis above liquid-nitrogen temperatures. An effective energy barrier to reversal of the magnetization of U eff = 1541 wave number is also measured. The magnetic blocking temperature of T B = 80 kelvin for this cation overcomes an essential barrier toward the development of nanomagnet devices that function at practical temperatures.

Keywords: Chemistry

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Circuit QED with a quantum-dot charge qubit dressed by Cooper pairs (2018)

L. E Bruhat, T. Cubaynes, J. J. Viennot, M. C. Dartiailh, M. M. Desjardins, A. Cottet, and T. Kontos

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-19

Description: Author(s): L. E Bruhat, T. Cubaynes, J. J. Viennot, M. C. Dartiailh, M. M. Desjardins, A. Cottet, and T. Kontos Coupling double-quantum-dot circuits to microwave cavities provides a powerful means to control, couple, and manipulate qubits based on the charge or spin of individual electrons. Here, we revisit this standard configuration by adding superconductivity to the circuit. We combine theory and experimen... [Phys. Rev. B 98, 155313] Published Thu Oct 18, 2018

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Dimensionally mixed coupled collective modes (2018)

E. H. Hwang, Ben Yu-Kuang Hu, and S. Das Sarma

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-19

Description: Author(s): E. H. Hwang, Ben Yu-Kuang Hu, and S. Das Sarma We develop the diagrammatic formulation of the many-body theory for the coupled collective modes in interacting electron systems of different dimensions. The formalism is then applied in detail to a two-dimensional (2D) system coupled to a three-dimensional (3D) electron gas. We find two dimensional... [Phys. Rev. B 98, 161304(R)] Published Thu Oct 18, 2018

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Carbon nanotubes help nickel work in water (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-19

Keywords: Chemistry

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Chiral Lewis acids integrated with single-walled carbon nanotubes for asymmetric catalysis in water (2018)

Kitanosono, T., Xu, P., Kobayashi, S.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-19

Description: The development of highly reactive and stereoselective catalytic systems is required not only to improve existing synthetic methods but also to invent distinct chemical reactions. Herein, a homogenized combination of nickel-based Lewis acid–surfactant-combined catalysts and single-walled carbon nanotubes is shown to exhibit substantial activity in water. In addition to the enhanced reactivity, stereoselective performance and long-term stability were demonstrated in asymmetric conjugate addition reactions of aldoximes to furnish chiral nitrones in high yields with excellent selectivities. The practical and straightforward application of the designed catalysts in water provides an expedient, environmentally benign, and highly efficient pathway to access optically active compounds.

Keywords: Chemistry

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Calculation of tunnel couplings in open gate-defined disordered quantum dot systems (2018)

Jan Klos, Fabian Hassler, Pascal Cerfontaine, Hendrik Bluhm, and Lars R. Schreiber

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-27

Description: Author(s): Jan Klos, Fabian Hassler, Pascal Cerfontaine, Hendrik Bluhm, and Lars R. Schreiber Quantum computation based on semiconductor electron-spin qubits requires high control of tunnel couplings between the quantum dots and the electron reservoirs. Potential disorder and the increasing complexity of the two-dimensional gate-defined quantum computing devices set high demands on the gate ... [Phys. Rev. B 98, 155320] Published Fri Oct 26, 2018

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Steps to smaller rings (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-11-02

Keywords: Chemistry

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Atomistic $S$-matrix method for numerical simulation of phonon reflection, transmission, and boundary scattering (2018)

Zhun-Yong Ong

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-06

Description: Author(s): Zhun-Yong Ong The control of phonon scattering by interfaces is critical to the manipulation of heat conduction in composite materials and semiconducting nanostructures. However, one of the factors limiting our understanding of elastic phonon scattering is the lack of a computationally efficient approach for desc... [Phys. Rev. B 98, 195301] Published Mon Nov 05, 2018

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Unconventional transport in low-density two-dimensional Rashba systems (2018)

Joel Hutchinson and Joseph Maciejko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-15

Description: Author(s): Joel Hutchinson and Joseph Maciejko Rashba spin-orbit coupling appears in 2D systems lacking inversion symmetry, and causes the spin-splitting of otherwise degenerate energy bands into an upper and lower helicity band. In this paper, we explore how impurity scattering affects transport in the ultralow density regime where electrons ar... [Phys. Rev. B 98, 195305] Published Wed Nov 14, 2018

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Conformational control of exciton-polariton physics in metal-poly(9,9-dioctylfluorene)-metal cavities (2018)

F. Le Roux and D. D. C. Bradley

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-16

Description: Author(s): F. Le Roux and D. D. C. Bradley Control is exerted over the exciton-polariton physics in metal-poly(9,9-dioctylfluorene)-metal microcavities via conformational changes to the polymer backbone. Using thin-film samples containing increasing fractions of β -phase chain segments, a systematic study is reported for the mode characterist... [Phys. Rev. B 98, 195306] Published Thu Nov 15, 2018

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Toward flying qubit spectroscopy (2018)

Benoît Rossignol, Thomas Kloss, Pacôme Armagnat, and Xavier Waintal

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-16

Description: Author(s): Benoît Rossignol, Thomas Kloss, Pacôme Armagnat, and Xavier Waintal While the coherent control of two-level quantum systems, qubits, is now standard, their continuum electronic equivalents, flying qubits, are much less developed. The first step in this direction has been achieved in dc interferometry experiments. Here, we propose a simple setup to perform the second... [Phys. Rev. B 98, 205302] Published Thu Nov 15, 2018

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Wigner solids of wide quantum wells near Landau filling $ν=1$ (2018)

A. T. Hatke, Yang Liu, L. W. Engel, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and M. Shayegan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-20

Description: Author(s): A. T. Hatke, Yang Liu, L. W. Engel, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and M. Shayegan Microwave spectroscopy within the Landau filling ( ν ) range of the integer quantum Hall effect (IQHE) has revealed pinning mode resonances signifying Wigner solids (WSs) composed of quasiparticles or -holes. We study pinning modes of WSs in wide quantum wells (WQWs) for 0.8 ≤ ν ≤ 1.2 , varying the density... [Phys. Rev. B 98, 195309] Published Mon Nov 19, 2018

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Electron exchange energy of neutral donors inside a quantum well (2018)

G. Garcia-Arellano, F. Bernardot, C. Testelin, and M. Chamarro

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-20

Description: Author(s): G. Garcia-Arellano, F. Bernardot, C. Testelin, and M. Chamarro We calculated the exchange energy of a pair of donor-bound electrons placed in the middle of an infinite quantum well (QW). In order to obtain this energy for any interdonor distance and for any QW thickness, we have first adapted to a QW the method developed by Gor’kov and Pitaevskii [L. P. Gor’kov... [Phys. Rev. B 98, 195308] Published Mon Nov 19, 2018

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Three-particle electron-hole complexes in two-dimensional electron systems (2018)

V. A. Kuznetsov, L. V. Kulik, M. D. Velikanov, A. S. Zhuravlev, A. V. Gorbunov, S. Schmult, and I. V. Kukushkin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-20

Description: Author(s): V. A. Kuznetsov, L. V. Kulik, M. D. Velikanov, A. S. Zhuravlev, A. V. Gorbunov, S. Schmult, and I. V. Kukushkin Three-particle complexes consisting of two holes in the completely filled zero-electron Landau level and an excited electron in the unoccupied first Landau level are investigated in a quantum Hall insulator. The distinctive features of these three-particle complexes are an electron-hole mass symmetr... [Phys. Rev. B 98, 205303] Published Mon Nov 19, 2018

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Single-beam resonant spin amplification of electrons interacting with nuclei in a GaAs/(Al,Ga)As quantum well (2018)

M. Kotur, F. Saeed, R. W. Mocek, V. L. Korenev, I. A. Akimov, A. S. Bhatti, D. R. Yakovlev, D. Suter, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-21

Description: Author(s): M. Kotur, F. Saeed, R. W. Mocek, V. L. Korenev, I. A. Akimov, A. S. Bhatti, D. R. Yakovlev, D. Suter, and M. Bayer The dynamic polarization of nuclear spins interacting with resident electrons under resonant excitation of trions is studied in a nominally undoped GaAs/(Al,Ga)As quantum well. Unlike in common time-resolved pump-probe techniques, we used a single-beam approach in which the excitation light is modul... [Phys. Rev. B 98, 205304] Published Tue Nov 20, 2018

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Long coherent dynamics of localized excitons in (In,Ga)N/GaN quantum wells (2018)

S. V. Poltavtsev, I. A. Solovev, I. A. Akimov, V. V. Chaldyshev, W. V. Lundin, A. V. Sakharov, A. F. Tsatsulnikov, D. R. Yakovlev, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-30

Description: Author(s): S. V. Poltavtsev, I. A. Solovev, I. A. Akimov, V. V. Chaldyshev, W. V. Lundin, A. V. Sakharov, A. F. Tsatsulnikov, D. R. Yakovlev, and M. Bayer We study the coherent dynamics of localized excitons in 100 periods of 2.5-nm-thick (In,Ga)N/GaN quantum wells with 7.5% indium concentration, measured with spectroscopic resolution through two-pulse and three-pulse photon echoes at the temperature of 1.5 K. A long-lived coherent exciton dynamics is... [Phys. Rev. B 98, 195315] Published Thu Nov 29, 2018

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Pinpointing the role of geometric phase (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-12-14

Keywords: Chemistry

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Control of the two-electron exchange interaction in a nanowire double quantum dot (2018)

Zhi-Hai Liu, O. Entin-Wohlman, A. Aharony, and J. Q. You

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-15

Description: Author(s): Zhi-Hai Liu, O. Entin-Wohlman, A. Aharony, and J. Q. You The two-electron exchange coupling in a nanowire double quantum dot (DQD) is shown to possess Moriya's anisotropic superexchange interaction under the influence of both the Rashba and Dresselhaus spin-orbit couplings (SOCs) and a Zeeman field. We reveal the controllability of the anisotropic exchang... [Phys. Rev. B 98, 241303(R)] Published Fri Dec 14, 2018

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Optimal electromechanical control of the excitonic fine structures of droplet epitaxial quantum dots (2018)

Shun-Jen Cheng, Yi Yang, Yu-Nien Wu, Yu-Huai Liao, and Guan-Hao Peng

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-20

Description: Author(s): Shun-Jen Cheng, Yi Yang, Yu-Nien Wu, Yu-Huai Liao, and Guan-Hao Peng The intrinsic fine structure splittings (FSSs) of the exciton states of semiconductor quantum dots (QDs) are known to be the major obstacle for realizing the QD-based entangled photon pair emitters. In this paper, we present a theoretical and computational investigation of the excitonic fine structu... [Phys. Rev. B 98, 155315] Published Fri Oct 19, 2018

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Carrier-mediated optomechanical forces in semiconductor nanomembranes with coupled quantum wells (2018)

Andreas Barg, Leonardo Midolo, Gabija Kiršanskė, Petru Tighineanu, Tommaso Pregnolato, Ataç İmamoǧlu, Peter Lodahl, Albert Schliesser, Søren Stobbe, and Eugene S. Polzik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-23

Description: Author(s): Andreas Barg, Leonardo Midolo, Gabija Kiršanskė, Petru Tighineanu, Tommaso Pregnolato, Ataç İmamoǧlu, Peter Lodahl, Albert Schliesser, Søren Stobbe, and Eugene S. Polzik In the majority of optomechanical experiments, the interaction between light and mechanical motion is mediated by radiation pressure, which arises from momentum transfer of reflecting photons. This is an inherently weak interaction, and optically generated carriers in semiconductors have been predic... [Phys. Rev. B 98, 155316] Published Mon Oct 22, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Towards simulation at picometer-scale resolution: Revisiting inversion domain boundaries in GaN (2018)

Frédéric Lançon, Luigi Genovese, and Joël Eymery

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-24

Description: Author(s): Frédéric Lançon, Luigi Genovese, and Joël Eymery Motivated by recent high resolution results on the inversion domain boundaries (IDB) in gallium nitride, we refine by ab initio DFT calculations the well established atomic model IDB * derived by Northrup et al. This allows us to recover these experimental results obtained by coherent x-ray diffracti... [Phys. Rev. B 98, 165306] Published Tue Oct 23, 2018

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Salt and iron ease the way to amines (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-10-26

Keywords: Chemistry

Print ISSN: 0036-8075

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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Effective edge state dynamics in the fractional quantum Hall effect (2018)

R. Fern, R. Bondesan, and S. H. Simon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-30

Description: Author(s): R. Fern, R. Bondesan, and S. H. Simon The authors consider here the behavior of quantum Hall edges away from the Luttinger liquid fixed point that describes the low energy, large system limit. Using the links between quantum Hall wave functions and conformal field theories, they construct effective Hamiltonians and constrain their forms by considering bulk symmetries. In examining the effect of bulk interactions on this edge, they find remarkable simplifications to these effective theories that allow a very accurate description of the low-energy physics of quantum Hall edges relatively far away from the Luttinger liquid fixed point, and that apply to small systems and higher energies. [Phys. Rev. B 98, 155321] Published Mon Oct 29, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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High-harmonic generation from few-layer hexagonal boron nitride: Evolution from monolayer to bulk response (2018)

Guillaume Le Breton, Angel Rubio, and Nicolas Tancogne-Dejean

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-30

Description: Author(s): Guillaume Le Breton, Angel Rubio, and Nicolas Tancogne-Dejean Two-dimensional materials offer a versatile platform to study high-harmonic generation (HHG), encompassing as limiting cases bulklike and atomiclike harmonic generation [Tancogne-Dejean and Rubio, Sci. Adv. 4 , eaao5207 (2018) ]. Understanding the high-harmonic response of few-layer semiconducting sys... [Phys. Rev. B 98, 165308] Published Mon Oct 29, 2018

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Imaging empty states on the Ge(100) surface at 12 K (2018)

M. Kuzmin, J. Mäkelä, J.-P. Lehtiö, M. Yasir, M. Tuominen, Z. S. Jahanshah Rad, A. Lahti, M. P. J. Punkkinen, P. Laukkanen, and K. Kokko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-10-30

Description: Author(s): M. Kuzmin, J. Mäkelä, J.-P. Lehtiö, M. Yasir, M. Tuominen, Z. S. Jahanshah Rad, A. Lahti, M. P. J. Punkkinen, P. Laukkanen, and K. Kokko Our understanding of bias-dependent scanning-tunneling-microscopy (STM) images is complicated not only by the multiplicity of the surface electronic structure, but also the manifold tunneling effects in probing semiconductor surfaces having directional dangling- and covalent-bond orbitals. Here we p... [Phys. Rev. B 98, 155322] Published Mon Oct 29, 2018

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Deconvolution of Rashba and Dresselhaus spin-orbit coupling by crystal axis dependent measurements of coupled InAs/GaSb quantum wells (2018)

C. S. Knox, L. H. Li, M. C. Rosamond, E. H. Linfield, and C. H. Marrows

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-01

Description: Author(s): C. S. Knox, L. H. Li, M. C. Rosamond, E. H. Linfield, and C. H. Marrows The Dresselhaus spin-orbit interaction is expected to perturb the quantum spin Hall phase predicted to arise within InAs/GaSb coupled quantum wells. To gain a greater understanding of this interaction, the spin-orbit coupling in two InAs/GaSb coupled quantum well samples, grown along the [001] axis,... [Phys. Rev. B 98, 155323] Published Wed Oct 31, 2018

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Catalytic palladium-oxyallyl cycloaddition (2018)

Trost, B. M., Huang, Z., Murhade, G. M.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-11-02

Description: Exploration of intermediates that enable chemoselective cycloaddition reactions and expeditious construction of fused- or bridged-ring systems is a continuous challenge for organic synthesis. As an intermediate of interest, the oxyallyl cation has been harnessed to synthesize architectures containing seven-membered rings via (4+3) cycloaddition. However, its potential to access five-membered skeletons is underdeveloped, largely due to the thermally forbidden (3+2) pathway. Here, the combination of a tailored precursor and a Pd(0) catalyst generates a Pd-oxyallyl intermediate that cyclizes with conjugated dienes to produce a diverse array of tetrahydrofuran skeletons. The cycloaddition overrides conventional (4+3) selectivity by proceeding through a stepwise pathway involving a Pd-allyl transfer and ring closure sequence. Subsequent treatment of the (3+2) adducts with a palladium catalyst converts the heterocycles to the carbocyclic cyclopentanones.

Keywords: Chemistry

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Dark exciton brightening and its engaged valley dynamics in monolayer ${\mathrm{WSe}}_{2}$ (2018)

Railson Vasconcelos, Helena Bragança, Fanyao Qu, and Jiyong Fu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-09

Description: Author(s): Railson Vasconcelos, Helena Bragança, Fanyao Qu, and Jiyong Fu We theoretically investigate the valley Zeeman splitting, dark-exciton brightening, and magnetic-field-controlled dark-exciton engaged valley dynamics in monolayer WSe 2 subjected to a tilted magnetic field B . In Faraday geometry (out-of-plane B ⊥ ), only bright-exciton emissions emerge, and the valley... [Phys. Rev. B 98, 195302] Published Thu Nov 08, 2018

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Spontaneous formation of spin lattices in semimagnetic exciton-polariton condensates (2018)

Paweł Miętki and Michał Matuszewski

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-10

Description: Author(s): Paweł Miętki and Michał Matuszewski An exciton-polariton microcavity that incorporates magnetic ions can exhibit spontaneous self-trapping phenomenon which is an analog of the classical polaron effect. We investigate in detail the full model of a polariton condensate that includes pumping and losses, the spin degree of freedom, extern... [Phys. Rev. B 98, 195303] Published Fri Nov 09, 2018

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Dephasing of InAs quantum dot $p$-shell excitons studied using two-dimensional coherent spectroscopy (2018)

Takeshi Suzuki, Rohan Singh, Galan Moody, Marc Aßmann, Manfred Bayer, Arne Ludwig, Andreas D. Wieck, and Steven T. Cundiff

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-13

Description: Author(s): Takeshi Suzuki, Rohan Singh, Galan Moody, Marc Aßmann, Manfred Bayer, Arne Ludwig, Andreas D. Wieck, and Steven T. Cundiff The dephasing mechanisms of p -shell and s -shell excitons in an InAs self-assembled quantum dot ensemble are examined using two-dimensional coherent spectroscopy (2DCS). 2DCS provides a comprehensive picture of how the energy level structure of dots affects the exciton dephasing rates and recombinati... [Phys. Rev. B 98, 195304] Published Mon Nov 12, 2018

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Heterocycles meet and marry on phosphorus (2018)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publication Date: 2018-11-16

Keywords: Chemistry

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Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics

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Photoluminescence study of interband transitions in few-layer, pseudomorphic, and strain-unbalanced Ge/GeSi multiple quantum wells (2018)

M. Montanari, M. Virgilio, C. L. Manganelli, P. Zaumseil, M. H. Zoellner, Y. Hou, M. A. Schubert, L. Persichetti, L. Di Gaspare, M. De Seta, E. Vitiello, E. Bonera, F. Pezzoli, and G. Capellini

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-20

Description: Author(s): M. Montanari, M. Virgilio, C. L. Manganelli, P. Zaumseil, M. H. Zoellner, Y. Hou, M. A. Schubert, L. Persichetti, L. Di Gaspare, M. De Seta, E. Vitiello, E. Bonera, F. Pezzoli, and G. Capellini In this paper we investigate the structural and optical properties of few strain-unbalanced multiple Ge/GeSi quantum wells pseudomorphically grown on GeSi reverse-graded substrates. The obtained high epitaxial quality demonstrates that strain symmetrization is not a mandatory requirement for few qua... [Phys. Rev. B 98, 195310] Published Mon Nov 19, 2018

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Structural identification of silicene on the Ag(111) surface by atomic force microscopy (2018)

Lingyu Feng, Keisuke Yabuoshi, Yoshiaki Sugimoto, Jo Onoda, Masahiro Fukuda, and Taisuke Ozaki

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-22

Description: Author(s): Lingyu Feng, Keisuke Yabuoshi, Yoshiaki Sugimoto, Jo Onoda, Masahiro Fukuda, and Taisuke Ozaki Silicene is a two-dimensional atomic layer material with buckled honeycomb arrangements of Si atoms. The diversity of those arrangements, which expands its potential applications, makes it difficult to determine its structure in any particular case. In this paper, we show that atomic force microscop... [Phys. Rev. B 98, 195311] Published Wed Nov 21, 2018

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$g$-factor of electrons in gate-defined quantum dots in a strong in-plane magnetic field (2018)

Peter Stano, Chen-Hsuan Hsu, Marcel Serina, Leon C. Camenzind, Dominik M. Zumbühl, and Daniel Loss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-28

Description: Author(s): Peter Stano, Chen-Hsuan Hsu, Marcel Serina, Leon C. Camenzind, Dominik M. Zumbühl, and Daniel Loss We analyze orbital effects of an in-plane magnetic field on the spin structure of states of a gated quantum dot based in a two-dimensional electron gas. Starting with a k · p Hamiltonian, we perturbatively calculate these effects for the conduction band of GaAs, up to the third power of the magnetic f... [Phys. Rev. B 98, 195314] Published Tue Nov 27, 2018

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Signatures of long-range spin-spin interactions in an (In,Ga)As quantum dot ensemble (2018)

Andreas Fischer, Eiko Evers, Steffen Varwig, Alex Greilich, Manfred Bayer, and Frithjof B. Anders

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-28

Description: Author(s): Andreas Fischer, Eiko Evers, Steffen Varwig, Alex Greilich, Manfred Bayer, and Frithjof B. Anders We present an investigation of the electron spin dynamics in an ensemble of singly charged semiconductor quantum dots subject to an external magnetic field and laser pumping with circularly polarized light. The spectral laser width is tailored such that ensembles with an increasing number of quantum... [Phys. Rev. B 98, 205308] Published Tue Nov 27, 2018

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Topological states on uneven (Pb,Sn)Se (001) surfaces (2018)

Rafał Rechciński and Ryszard Buczko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-07

Description: Author(s): Rafał Rechciński and Ryszard Buczko The impact of surface morphology on the electronic structure of topological crystalline insulators is studied theoretically. As an example, the structure of topologically protected electronic states on a (001) (Pb,Sn)Se surface with terraces of atomic height is modeled. Within the envelope function ... [Phys. Rev. B 98, 245302] Published Thu Dec 06, 2018

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Influence of the Majorana nonlocality on the supercurrent (2018)

Alexander Schuray, Alfredo Levy Yeyati, and Patrik Recher

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-07

Description: Author(s): Alexander Schuray, Alfredo Levy Yeyati, and Patrik Recher We study the equilibrium Josephson current between an s -wave superconductor and a topological superconducting nanowire with Majorana bound states (MBS) at its ends. Within a low-energy model, we show analytically that the nonlocality of the MBS allows for a finite supercurrent to flow that otherwise... [Phys. Rev. B 98, 235301] Published Thu Dec 06, 2018

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Sign-alternating photoconductivity and magnetoresistance oscillations induced by terahertz radiation in HgTe quantum wells (2018)

M. Otteneder, I. A. Dmitriev, S. Candussio, M. L. Savchenko, D. A. Kozlov, V. V. Bel'kov, Z. D. Kvon, N. N. Mikhailov, S. A. Dvoretsky, and S. D. Ganichev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-08

Description: Author(s): M. Otteneder, I. A. Dmitriev, S. Candussio, M. L. Savchenko, D. A. Kozlov, V. V. Bel'kov, Z. D. Kvon, N. N. Mikhailov, S. A. Dvoretsky, and S. D. Ganichev We report on the observation of terahertz radiation induced photoconductivity and of terahertz analog of the microwave-induced resistance oscillations (MIRO) in HgTe-based quantum well (QW) structures of different width. The MIRO-like effect has been detected in QWs of 20 nm thickness with inverted ... [Phys. Rev. B 98, 245304] Published Fri Dec 07, 2018

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Microwave photocurrent from the edge states of InAs/GaInSb bilayers (2018)

Jie Zhang, Tingxin Li, Rui-Rui Du, and Gerard Sullivan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-11

Description: Author(s): Jie Zhang, Tingxin Li, Rui-Rui Du, and Gerard Sullivan We measure microwave photocurrent in devices made from InAs/GaInSb bilayers where both the insulating bulk state and conducting edge state were observed in the inverted-band regime, consistent with the theoretical prediction for a quantum spin Hall (QSH) insulator. It has been theoretically proposed... [Phys. Rev. B 98, 241301(R)] Published Mon Dec 10, 2018

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Phase transitions induced by a lateral superlattice potential in a two-dimensional electron gas (2018)

Alice Blanchette and René Côté

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-12

Description: Author(s): Alice Blanchette and René Côté We study the phase transitions induced by a lateral superlattice potential (a metallic grid) placed on top of a two-dimensional electron gas (2DEG) formed in a semiconductor quantum well. In a quantizing magnetic field and at filling factor ν = 1 , the ground state of the 2DEG depends on the strength V ... [Phys. Rev. B 98, 245306] Published Tue Dec 11, 2018

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