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  • 1
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    Gate controlled electronic transport in monolayer MoS2 field effect transistor (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-03-14
    Description: The electronic spin and valley transport properties of a monolayer MoS 2 are investigated using the non-equilibrium Green's function formalism combined with density functional theory. Due to the presence of strong Rashba spin orbit interaction (RSOI), the electronic valence bands of monolayer MoS 2 are split into spin up and spin down Zeeman-like texture near the two inequivalent vertices K and K′ of the first Brillouin zone. When the gate voltage is applied in the scattering region, an additional strong RSOI is induced which generates an effective magnetic field. As a result, electron spin precession occurs along the effective magnetic field, which is controlled by the gate voltage. This, in turn, causes the oscillation of conductance as a function of the magnitude of the gate voltage and the length of the gate region. This current modulation due to the spin precession shows the essential feature of the long sought Datta-Das field effect transistor (FET). From our results, the oscillation periods for the gate voltage and gate length are found to be approximately 2.2 V and 20.03 a B ( a B is Bohr radius), respectively. These observations can be understood by a simple spin precessing model and indicate that the electron behaviors in monolayer MoS 2 FET are both spin and valley related and can easily be controlled by the gate.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Heat transport study of the spin liquid candidate $1T\text{−}{\mathrm{TaS}}_{2}$ (2017)
    American Physical Society (APS)
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    Publication Date: 2017-08-23
    Description: Author(s): Y. J. Yu, Y. Xu, L. P. He, M. Kratochvilova, Y. Y. Huang, J. M. Ni, Lihai Wang, Sang-Wook Cheong, Je-Geun Park, and S. Y. Li We present ultralow-temperature thermal conductivity measurements on single crystals of the prototypical charge-density-wave material 1 T − TaS 2 , which was recently argued to be a candidate for a quantum spin liquid. Our experiments show that the residual linear term of thermal conductivity at zero fie... [Phys. Rev. B 96, 081111(R)] Published Fri Aug 18, 2017
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Ultralow-Temperature Thermal Conductivity of the Kitaev Honeycomb Magnet $α\text{−}{\mathrm{RuCl}}_{3}$ across the Field-Induced Phase Transition (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-02-09
    Description: Author(s): Y. J. Yu, Y. Xu, K. J. Ran, J. M. Ni, Y. Y. Huang, J. H. Wang, J. S. Wen, and S. Y. Li Recently, there have been increasingly hot debates on whether there exists a quantum spin liquid in the Kitaev honeycomb magnet α - RuCl 3 in a high magnetic field. To investigate this issue, we perform ultralow-temperature thermal conductivity measurements on single crystals of α - RuCl 3 down to 80 mK a... [Phys. Rev. Lett. 120, 067202] Published Thu Feb 08, 2018
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Tuning phase transitions in FeSe thin flakes by field-effect transistor with solid ion conductor as the gate dielectric (2017)
    American Physical Society (APS)
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    Publication Date: 2017-01-31
    Description: Author(s): B. Lei, N. Z. Wang, C. Shang, F. B. Meng, L. K. Ma, X. G. Luo, T. Wu, Z. Sun, Y. Wang, Z. Jiang, B. H. Mao, Z. Liu, Y. J. Yu, Y. B. Zhang, and X. H. Chen We have developed a field-effect transistor (FET) device using a solid ion conductor (SIC) as the gate dielectric, which can tune the carrier density of FeSe by driving lithium ions in and out of the FeSe thin flakes and consequently control the physical properties and phase transitions. A dome-shap… [Phys. Rev. B 95, 020503(R)] Published Mon Jan 30, 2017
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 5
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    Nature of the first-order liquid-liquid phase transition in supercooled silicon (2015)
    American Institute of Physics (AIP)
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    Publication Date: 2015-08-08
    Description: The first-order liquid-liquid phase transition in supercooled Si is revisited by long-time first-principle molecular dynamics simulations. As the focus of the present paper, its nature is revealed by analyzing the inherent structures of low-density liquid (LDL) and high-density liquid (HDL). Our results show that it is a transition between a sp 3 -hybridization LDL and a white-tin-like HDL. This uncovers the origin of the semimetal-metal transition accompanying it and also proves that HDL is the metastable extension of high temperature equilibrium liquid into the supercooled regime. The pressure-temperature diagram of supercooled Si thus can be regarded in some respects as shifted reflection of its crystalline phase diagram.
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics (AIP)
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  • 6
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    Structural basis of type II topoisomerase inhibition by the anticancer drug etoposide (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-07-23
    Description: Type II topoisomerases (TOP2s) resolve the topological problems of DNA by transiently cleaving both strands of a DNA duplex to form a cleavage complex through which another DNA segment can be transported. Several widely prescribed anticancer drugs increase the population of TOP2 cleavage complex, which leads to TOP2-mediated chromosome DNA breakage and death of cancer cells. We present the crystal structure of a large fragment of human TOP2beta complexed to DNA and to the anticancer drug etoposide to reveal structural details of drug-induced stabilization of a cleavage complex. The interplay between the protein, the DNA, and the drug explains the structure-activity relations of etoposide derivatives and the molecular basis of drug-resistant mutations. The analysis of protein-drug interactions provides information applicable for developing an isoform-specific TOP2-targeting strategy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, Chyuan-Chuan -- Li, Tsai-Kun -- Farh, Lynn -- Lin, Li-Ying -- Lin, Te-Sheng -- Yu, Yu-Jen -- Yen, Tien-Jui -- Chiang, Chia-Wang -- Chan, Nei-Li -- New York, N.Y. -- Science. 2011 Jul 22;333(6041):459-62. doi: 10.1126/science.1204117.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biochemistry and Molecular Biology, College of Medicine, National Taiwan University, Taipei City 100, Taiwan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21778401" target="_blank"〉PubMed〈/a〉
    Keywords: Base Pairing ; Catalytic Domain ; Crystallography, X-Ray ; DNA/*chemistry/metabolism ; DNA Topoisomerases, Type II/*chemistry/genetics/metabolism ; DNA-Binding Proteins/*chemistry/genetics/metabolism ; Drug Resistance, Neoplasm ; Etoposide/analogs & derivatives/*chemistry/metabolism/*pharmacology ; Humans ; Models, Molecular ; Mutant Proteins/chemistry/metabolism ; Mutation ; Protein Multimerization ; Protein Structure, Quaternary ; Protein Structure, Tertiary ; Structure-Activity Relationship ; Topoisomerase II Inhibitors/*chemistry/metabolism/*pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Phase behavior of metastable liquid silicon at negative pressure: Ab initio molecular dynamics (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-04-06
    Description: Author(s): G. Zhao, Y. J. Yu, J. L. Yan, M. C. Ding, X. G. Zhao, and H. Y. Wang Extensive first-principle molecular dynamics simulations are performed to study the phase behavior of metastable liquid Si at negative pressure. Our results show that the high-density liquid (HDL) and HDL-vapor spinodals indeed form a continuous reentrant curve and the liquid-liquid critical point s… [Phys. Rev. B 93, 140203(R)] Published Tue Apr 05, 2016
    Keywords: Inhomogeneous, disordered, and partially ordered systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Optimization strategy integrity for watershed agricultural non-point source pollution control based on Monte Carlo simulation (2016)
    Institute of Physics (IOP)
    Details
    Publication Date: 2016-09-03
    Description: This study has established a set of methodological systems by simulating loads and analyzing optimization strategy integrity for the optimization of watershed non-point source pollution control. First, the source of watershed agricultural non-point source pollution is divided into four aspects, including agricultural land, natural land, livestock breeding, and rural residential land. Secondly, different pollution control measures at the source, midway and ending stages are chosen. Thirdly, the optimization effect of pollution load control in three stages are simulated, based on the Monte Carlo simulation. The method described above is applied to the Ashi River watershed in Heilongjiang Province of China. Case study results indicate that the combined three types of control measures can be implemented only if the government promotes the optimized plan and gradually improves implementation efficiency. This method for the optimization strategy integrity for watershed non-point sourc...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 9
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    Nodal superconductivity in FeS: Evidence from quasiparticle heat transport (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-09-30
    Description: Author(s): T. P. Ying, X. F. Lai, X. C. Hong, Y. Xu, L. P. He, J. Zhang, M. X. Wang, Y. J. Yu, F. Q. Huang, and S. Y. Li We report low-temperature heat transport measurements on superconducting iron sulfide FeS with T c ≈ 5 K, which has the same crystal structure and similar electronic band structure to the superconducting iron selenide FeSe. In zero magnetic field, a significant residual linear term κ 0 / T is observed. At… [Phys. Rev. B 94, 100504(R)] Published Thu Sep 29, 2016
    Keywords: Superfluidity and superconductivity
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    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 10
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    Visualizing coherent intermolecular dipole-dipole coupling in real space (2016)
    Nature Publishing Group (NPG)
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    Publication Date: 2016-04-01
    Description: Many important energy-transfer and optical processes, in both biological and artificial systems, depend crucially on excitonic coupling that spans several chromophores. Such coupling can in principle be described in a straightforward manner by considering the coherent intermolecular dipole-dipole interactions involved. However, in practice, it is challenging to directly observe in real space the coherent dipole coupling and the related exciton delocalizations, owing to the diffraction limit in conventional optics. Here we demonstrate that the highly localized excitations that are produced by electrons tunnelling from the tip of a scanning tunnelling microscope, in conjunction with imaging of the resultant luminescence, can be used to map the spatial distribution of the excitonic coupling in well-defined arrangements of a few zinc-phthalocyanine molecules. The luminescence patterns obtained for excitons in a dimer, which are recorded for different energy states and found to resemble sigma and pi molecular orbitals, reveal the local optical response of the system and the dependence of the local optical response on the relative orientation and phase of the transition dipoles of the individual molecules in the dimer. We generate an in-line arrangement up to four zinc-phthalocyanine molecules, with a larger total transition dipole, and show that this results in enhanced 'single-molecule' superradiance from the oligomer upon site-selective excitation. These findings demonstrate that our experimental approach provides detailed spatial information about coherent dipole-dipole coupling in molecular systems, which should enable a greater understanding and rational engineering of light-harvesting structures and quantum light sources.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Yang -- Luo, Yang -- Zhang, Yao -- Yu, Yun-Jie -- Kuang, Yan-Min -- Zhang, Li -- Meng, Qiu-Shi -- Luo, Yi -- Yang, Jin-Long -- Dong, Zhen-Chao -- Hou, J G -- England -- Nature. 2016 Mar 31;531(7596):623-7. doi: 10.1038/nature17428.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27029277" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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