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Asymmetric Free-Space Light Transport at Nonlinear Metasurfaces (2018)

Nir Shitrit, Jeongmin Kim, David S. Barth, Hamidreza Ramezani, Yuan Wang, and Xiang Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Nir Shitrit, Jeongmin Kim, David S. Barth, Hamidreza Ramezani, Yuan Wang, and Xiang Zhang Asymmetric light transport has significantly contributed to fundamental science and revolutionized advanced technology in various aspects such as unidirectional photonic devices, optical diodes, and isolators. While metasurfaces mold wave fronts at will with an ultrathin flat optical element, asymme... [Phys. Rev. Lett. 121, 046101] Published Tue Jul 24, 2018

Schlagwort(e): Condensed Matter: Structure, etc.

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Thema: Physik

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Complex saddle trajectories for multidimensional quantum wave packet and coherent state propagation: Application to a many-body system (2018)

Steven Tomsovic

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-08-04

Beschreibung: Author(s): Steven Tomsovic A practical search technique for finding the complex saddle points used in wave packet and coherent state propagation is developed which works for a large class of Hamiltonian dynamical systems with many degrees of freedom. The method can be applied to problems in atomic, molecular, and optical phys... [Phys. Rev. E 98, 023301] Published Fri Aug 03, 2018

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Glassy Phonon Heralds a Strain Glass State in a Shape Memory Alloy (2018)

P. J. Stonaha, I. Karaman, R. Arroyave, D. Salas, N. M. Bruno, Y. Wang, M. F. Chisholm, S. Chi, D. L. Abernathy, Y. I. Chumlyakov, and M. E. Manley

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-12

Beschreibung: Author(s): P. J. Stonaha, I. Karaman, R. Arroyave, D. Salas, N. M. Bruno, Y. Wang, M. F. Chisholm, S. Chi, D. L. Abernathy, Y. I. Chumlyakov, and M. E. Manley Shape memory strain glasses are frustrated ferroelastic materials with glasslike slow relaxation and nanodomains. It is possible to change a NiCoMnIn Heusler alloy from a martensitically transforming alloy to a nontransforming strain glass by annealing, but minimal differences are evident in the sho... [Phys. Rev. Lett. 120, 245701] Published Mon Jun 11, 2018

Schlagwort(e): Condensed Matter: Structure, etc.

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Engineering Surface Critical Behavior of ($2+1$)-Dimensional O(3) Quantum Critical Points (2018)

Chengxiang Ding, Long Zhang, and Wenan Guo

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-06-06

Beschreibung: Author(s): Chengxiang Ding, Long Zhang, and Wenan Guo Surface critical behavior (SCB) refers to the singularities of physical quantities on the surface at the bulk phase transition. It is closely related to and even richer than the bulk critical behavior. In this work, we show that three types of SCB universality are realized in the dimerized Heisenber... [Phys. Rev. Lett. 120, 235701] Published Tue Jun 05, 2018

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Unexpectedly High Salt Accumulation inside Carbon Nanotubes Soaked in Dilute Salt Solutions (2018)

Xueliang Wang, Guosheng Shi, Shanshan Liang, Jian Liu, Deyuan Li, Gang Fang, Renduo Liu, Long Yan, and Haiping Fang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-29

Beschreibung: Author(s): Xueliang Wang, Guosheng Shi, Shanshan Liang, Jian Liu, Deyuan Li, Gang Fang, Renduo Liu, Long Yan, and Haiping Fang We experimentally demonstrate the formation of salt aggregations with unexpectedly high concentration inside multiwalled carbon nanotubes (CNTs) soaked only in dilute salt solution sand even in solutions containing only traces of salts. This finding suggests the blocking of fluid across CNTs by the ... [Phys. Rev. Lett. 121, 226102] Published Wed Nov 28, 2018

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Optical admittance method for light-matter interaction in lossy planar resonators (2018)

Pyry Kivisaari, Mikko Partanen, and Jani Oksanen

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-12-05

Beschreibung: Author(s): Pyry Kivisaari, Mikko Partanen, and Jani Oksanen Advanced optoelectronic simulation models are needed to study and optimize emerging photonic devices such as thin-film solar cells, lasers, and light-emitting diodes (LEDs). In particular, better tools are required for self-consistent modeling of coupled electrical and optical systems. The recently ... [Phys. Rev. E 98, 063304] Published Tue Dec 04, 2018

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Policy-guided Monte Carlo: Reinforcement-learning Markov chain dynamics (2018)

Troels Arnfred Bojesen

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-12-05

Beschreibung: Author(s): Troels Arnfred Bojesen We introduce policy-guided Monte Carlo (PGMC), a computational framework using reinforcement learning to improve Markov chain Monte Carlo (MCMC) sampling. The methodology is generally applicable, unbiased, and opens up a path to automated discovery of efficient MCMC samplers. After developing a gene... [Phys. Rev. E 98, 063303] Published Tue Dec 04, 2018

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Probabilistic scheme for joint parameter estimation and state prediction in complex dynamical systems (2018)

Sara Pérez-Vieites, Inés P. Mariño, and Joaquín Míguez

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-12-06

Beschreibung: Author(s): Sara Pérez-Vieites, Inés P. Mariño, and Joaquín Míguez Many problems in physics demand the ability to calibrate the parameters and predict the time evolution of complex dynamical models using sequentially collected data. Here we introduce a general methodology for the joint estimation of the static parameters and the forecasting of the state variables o... [Phys. Rev. E 98, 063305] Published Wed Dec 05, 2018

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Cluster representations and the Wolff algorithm in arbitrary external fields (2018)

Jaron Kent-Dobias and James P. Sethna

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-12-08

Beschreibung: Author(s): Jaron Kent-Dobias and James P. Sethna We introduce a natural way to extend celebrated spin-cluster Monte Carlo algorithms for fast thermal lattice simulations at criticality, such as the Wolff algorithm, to systems in arbitrary fields, be they linear magnetic vector fields or nonlinear anisotropic ones. By generalizing the “ghost spin” ... [Phys. Rev. E 98, 063306] Published Fri Dec 07, 2018

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Quantum-to-Classical Transition of Proton Transfer in Potential-Induced Dioxygen Reduction (2018)

Ken Sakaushi, Andrey Lyalin, Tetsuya Taketsugu, and Kohei Uosaki

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-08

Beschreibung: Author(s): Ken Sakaushi, Andrey Lyalin, Tetsuya Taketsugu, and Kohei Uosaki We report an observation of a quantum tunneling effect in a proton-transfer (PT) during potential-induced transformation of dioxygen on a platinum electrode in a low overpotential ( η ) region at 298 K. However, this quantum process is converted to the classical PT scheme in the high η region. Therefo... [Phys. Rev. Lett. 121, 236001] Published Fri Dec 07, 2018

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Measurement of the Curvature-Dependent Surface Tension in Nucleating Colloidal Liquids (2018)

V. D. Nguyen, F. C. Schoemaker, E. M. Blokhuis, and P. Schall

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-15

Beschreibung: Author(s): V. D. Nguyen, F. C. Schoemaker, E. M. Blokhuis, and P. Schall The curvature dependence of the surface tension is central to the nucleation of liquids, but remains difficult to access experimentally and predict theoretically. This curvature dependence arises from the curvature-dependent molecular structure, which, for small nuclei, can deviate significantly fro... [Phys. Rev. Lett. 121, 246102] Published Fri Dec 14, 2018

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Three-dimensional multidomain lattice Boltzmann grid refinement for passive scalar transport (2018)

Tong-Miin Liou and Chun-Sheng Wang

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Tong-Miin Liou and Chun-Sheng Wang Simulations of passive scalar transport on a three-dimensional (3D) multiresolution grid are presented within the framework of single relaxation time lattice Boltzmann method. The combined modeling of the fluid flow and scalar transport is handled by a double distribution function approach in which ... [Phys. Rev. E 98, 013306] Published Tue Jul 24, 2018

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Kinetic Spinodal Instabilities in the Mott Transition in ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$: Evidence from Hysteresis Scaling and Dissipative Phase Ordering (2018)

Tapas Bar, Sujeet Kumar Choudhary, Md. Arsalan Ashraf, K. S. Sujith, Sanjay Puri, Satyabrata Raj, and Bhavtosh Bansal

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-07-25

Beschreibung: Author(s): Tapas Bar, Sujeet Kumar Choudhary, Md. Arsalan Ashraf, K. S. Sujith, Sanjay Puri, Satyabrata Raj, and Bhavtosh Bansal We present the first systematic observation of scaling of thermal hysteresis with the temperature scanning rate around an abrupt thermodynamic transition in correlated electron systems. We show that the depth of supercooling and superheating in vanadium sesquioxide ( V 2 O 3 ) shifts with the temperature... [Phys. Rev. Lett. 121, 045701] Published Tue Jul 24, 2018

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Counting Feynman diagrams via many-body relations (2018)

Fabian B. Kugler

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-08-08

Beschreibung: Author(s): Fabian B. Kugler We present an iterative algorithm to count Feynman diagrams via many-body relations. The algorithm allows us to count the number of diagrams of the exact solution for the general fermionic many-body problem at each order in the interaction. Further, we apply it to different parquet-type approximatio... [Phys. Rev. E 98, 023303] Published Tue Aug 07, 2018

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Consistent lattice Boltzmann modeling of low-speed isothermal flows at finite Knudsen numbers in slip-flow regime. II. Application to curved boundaries (2018)

Goncalo Silva

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-08-08

Beschreibung: Author(s): Goncalo Silva Gaseous flows inside microfluidic devices often fall in the slip-flow regime. According to this theoretical description, the Navier-Stokes model remains applicable in bulk, while at solid walls a slip velocity boundary model shall be considered. Physically, it is well established that, to properly a... [Phys. Rev. E 98, 023302] Published Tue Aug 07, 2018

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Experimental Demonstration of an Anisotropic Exceptional Point (2018)

Kun Ding, Guancong Ma, Z. Q. Zhang, and C. T. Chan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-22

Beschreibung: Author(s): Kun Ding, Guancong Ma, Z. Q. Zhang, and C. T. Chan Exceptional points (EPs) associated with a square-root singularity have been found in many non-Hermitian systems. In most of the studies, the EPs found are isotropic, meaning that the same singular behavior is obtained independent of the direction from which they are approached in the parameter spac... [Phys. Rev. Lett. 121, 085702] Published Tue Aug 21, 2018

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Numerical solutions of Fokker-Planck equations with drift-admitting jumps (2018)

Yaming Chen and Xiaogang Deng

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-09-05

Beschreibung: Author(s): Yaming Chen and Xiaogang Deng We develop a finite difference scheme based on a grid staggered by flux points and solution points to solve Fokker-Planck equations with drift-admitting jumps. To satisfy the matching conditions at the jumps, i.e., the continuities of the propagator and the probability current, the jumps are set to ... [Phys. Rev. E 98, 033302] Published Tue Sep 04, 2018

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Phase-field-based lattice Boltzmann model for multiphase ferrofluid flows (2018)

Yang Hu, Decai Li, and Xiaodong Niu

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-09-05

Beschreibung: Author(s): Yang Hu, Decai Li, and Xiaodong Niu In this work, the phase-field-based lattice Boltzmann model is extended to simulate the multiphase ferrofluid flows. The hydrodynamical behavior of the ferrofluids is modeled by the incompressible Navier-Stokes equations with the nonlinear Langevin magnetization law. The phase interface is tracked b... [Phys. Rev. E 98, 033301] Published Tue Sep 04, 2018

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Antisite Pairs Suppress the Thermal Conductivity of BAs (2018)

Qiang Zheng, Carlos A. Polanco, Mao-Hua Du, Lucas R. Lindsay, Miaofang Chi, Jiaqiang Yan, and Brian C. Sales

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-07

Beschreibung: Author(s): Qiang Zheng, Carlos A. Polanco, Mao-Hua Du, Lucas R. Lindsay, Miaofang Chi, Jiaqiang Yan, and Brian C. Sales BAs was predicted to have an unusually high thermal conductivity with a room temperature value of 2000 W m − 1 K − 1 , comparable to that of diamond. However, the experimentally measured thermal conductivity of BAs single crystals is still lower than this value. To identify the origin of this large inco... [Phys. Rev. Lett. 121, 105901] Published Thu Sep 06, 2018

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Classical molecular dynamics simulations of hydrogen plasmas and development of an analytical statistical model for computational validity assessment (2018)

M. A. Gigosos, D. González-Herrero, N. Lara, R. Florido, A. Calisti, S. Ferri, and B. Talin

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-09-18

Beschreibung: Author(s): M. A. Gigosos, D. González-Herrero, N. Lara, R. Florido, A. Calisti, S. Ferri, and B. Talin Classical molecular dynamics simulations of hydrogen plasmas have been performed with an emphasis on the analysis of the equilibration process. The theoretical basis of the simulation model as well as numerically relevant aspects, such as the proper choice and definition of simulation units, are dis... [Phys. Rev. E 98, 033307] Published Mon Sep 17, 2018

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Uncertainty quantification on the macroscopic properties of heterogeneous porous media (2018)

Peng Wang, Huali Chen, Xuhui Meng, Xin Jiang, Dongbin Xiu, and Xiaofan Yang

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-09-18

Beschreibung: Author(s): Peng Wang, Huali Chen, Xuhui Meng, Xin Jiang, Dongbin Xiu, and Xiaofan Yang Pore-scale simulation is an essential tool to understand complex physical process in many environmental problems. However, structural heterogeneity and data scarcity render the porous medium, and in turn its macroscopic properties, uncertain. Meanwhile, direct numerical simulation of the medium at t... [Phys. Rev. E 98, 033306] Published Mon Sep 17, 2018

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Direct Measurement of Anharmonic Decay Channels of a Coherent Phonon (2018)

Samuel W. Teitelbaum, Thomas Henighan, Yijing Huang, Hanzhe Liu, Mason P. Jiang, Diling Zhu, Matthieu Chollet, Takahiro Sato, Éamonn D. Murray, Stephen Fahy, Shane O’Mahony, Trevor P. Bailey, Ctirad Uher, Mariano Trigo, and David A. Reis

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-21

Beschreibung: Author(s): Samuel W. Teitelbaum, Thomas Henighan, Yijing Huang, Hanzhe Liu, Mason P. Jiang, Diling Zhu, Matthieu Chollet, Takahiro Sato, Éamonn D. Murray, Stephen Fahy, Shane O’Mahony, Trevor P. Bailey, Ctirad Uher, Mariano Trigo, and David A. Reis We report channel-resolved measurements of the anharmonic coupling of the coherent A 1 g phonon in photoexcited bismuth to pairs of high wave vector acoustic phonons. The decay of a coherent phonon can be understood as a parametric resonance process whereby the atomic displacement periodically modulat... [Phys. Rev. Lett. 121, 125901] Published Thu Sep 20, 2018

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Anomalous Phonon Lifetime Shortening in Paramagnetic CrN Caused by Spin-Lattice Coupling: A Combined Spin and Ab Initio Molecular Dynamics Study (2018)

Irina Stockem, Anders Bergman, Albert Glensk, Tilmann Hickel, Fritz Körmann, Blazej Grabowski, Jörg Neugebauer, and Björn Alling

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-22

Beschreibung: Author(s): Irina Stockem, Anders Bergman, Albert Glensk, Tilmann Hickel, Fritz Körmann, Blazej Grabowski, Jörg Neugebauer, and Björn Alling We study the mutual coupling of spin fluctuations and lattice vibrations in paramagnetic CrN by combining atomistic spin dynamics and ab initio molecular dynamics. The two degrees of freedom are dynamically coupled, leading to nonadiabatic effects. Those effects suppress the phonon lifetimes at low ... [Phys. Rev. Lett. 121, 125902] Published Fri Sep 21, 2018

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Nanosecond Melting and Recrystallization in Shock-Compressed Silicon (2018)

Stefan J. Turneaure, Surinder M. Sharma, and Y. M. Gupta

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-09-26

Beschreibung: Author(s): Stefan J. Turneaure, Surinder M. Sharma, and Y. M. Gupta X-ray diffraction measurements of shock compressed silicon show loss of all sharp diffraction peaks followed by nanosecond recrystallization, proving that the silicon was melted and not amorphized. [Phys. Rev. Lett. 121, 135701] Published Tue Sep 25, 2018

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Gregory-Newton problem for kissing sticky spheres (2018)

Lukas Trombach and Peter Schwerdtfeger

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-09-29

Beschreibung: Author(s): Lukas Trombach and Peter Schwerdtfeger All possible nonisomorphic arrangements of 12 spheres kissing a central sphere (the Gregory-Newton problem) are obtained for the sticky-hard-sphere (SHS) model and subsequently projected by geometry optimization onto a set of structures derived from an attractive Lennard-Jones (LJ) type of potential... [Phys. Rev. E 98, 033311] Published Fri Sep 28, 2018

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Sound Propagation in a Uniform Superfluid Two-Dimensional Bose Gas (2018)

J. L. Ville, R. Saint-Jalm, É. Le Cerf, M. Aidelsburger, S. Nascimbène, J. Dalibard, and J. Beugnon

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-04

Beschreibung: Author(s): J. L. Ville, R. Saint-Jalm, É. Le Cerf, M. Aidelsburger, S. Nascimbène, J. Dalibard, and J. Beugnon Experiments and simulations indicate that collisionless interactions among atoms in a 2D Bose gas can transmit sound waves. [Phys. Rev. Lett. 121, 145301] Published Wed Oct 03, 2018

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Collisionless Sound in a Uniform Two-Dimensional Bose Gas (2018)

Miki Ota, Fabrizio Larcher, Franco Dalfovo, Lev Pitaevskii, Nick P. Proukakis, and Sandro Stringari

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-04

Beschreibung: Author(s): Miki Ota, Fabrizio Larcher, Franco Dalfovo, Lev Pitaevskii, Nick P. Proukakis, and Sandro Stringari Experiments and simulations indicate that collisionless interactions among atoms in a 2D Bose gas can transmit sound waves. [Phys. Rev. Lett. 121, 145302] Published Wed Oct 03, 2018

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Grain Boundary Sliding and Amorphization are Responsible for the Reverse Hall-Petch Relation in Superhard Nanocrystalline Boron Carbide (2018)

Dezhou Guo, Shuangxi Song, Ruichun Luo, William A. Goddard, III, Mingwei Chen, Kolan Madhav Reddy, and Qi An

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-05

Beschreibung: Author(s): Dezhou Guo, Shuangxi Song, Ruichun Luo, William A. Goddard, III, Mingwei Chen, Kolan Madhav Reddy, and Qi An The recent observation of the reverse Hall-Petch relation in nanocrystalline ceramics offers a possible pathway to achieve enhanced ductility for traditional brittle ceramics via the nanosize effect, just as nanocrystalline metals and alloys. However, the underlying deformation mechanisms of nanocry... [Phys. Rev. Lett. 121, 145504] Published Thu Oct 04, 2018

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Nonequilibrium Solute Capture in Passivating Oxide Films (2018)

Xiao-xiang Yu, Ahmet Gulec, Quentin Sherman, Katie Lutton Cwalina, John R. Scully, John H. Perepezko, Peter W. Voorhees, and Laurence D. Marks

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-05

Beschreibung: Author(s): Xiao-xiang Yu, Ahmet Gulec, Quentin Sherman, Katie Lutton Cwalina, John R. Scully, John H. Perepezko, Peter W. Voorhees, and Laurence D. Marks We report experimental results on the composition and crystallography of oxides formed on NiCrMo alloys during both high-temperature oxidation and aqueous corrosion experiments. Detailed characterization using transmission electron microscopy and diffraction, aberration-corrected chemical analysis, ... [Phys. Rev. Lett. 121, 145701] Published Thu Oct 04, 2018

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Nanosecond Freezing of Water at High Pressures: Nucleation and Growth near the Metastability Limit (2018)

Philip C. Myint, Alexander A. Chernov, Babak Sadigh, Lorin X. Benedict, Burl M. Hall, Sebastien Hamel, and Jonathan L. Belof

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-11

Beschreibung: Author(s): Philip C. Myint, Alexander A. Chernov, Babak Sadigh, Lorin X. Benedict, Burl M. Hall, Sebastien Hamel, and Jonathan L. Belof A classical theory explains the nucleation and growth of ice VII under shockwave conditions. [Phys. Rev. Lett. 121, 155701] Published Wed Oct 10, 2018

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Standard error estimation by an automated blocking method (2018)

Marius Jonsson

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-10-16

Beschreibung: Author(s): Marius Jonsson The sample mean X ¯ is probably the most popular estimator of the expected value in all sciences and var ( X ¯ ) measures the error (standard- and mean-square-errors). Here, an alternative approach to estimation of var ( X ¯ ) for time series data is presented. The method has an accuracy similar to dependent... [Phys. Rev. E 98, 043304] Published Mon Oct 15, 2018

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Random sequential adsorption of unoriented rectangles at saturation (2018)

Wojciech Kasperek, Piotr Kubala, and Michał Cieśla

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-12-18

Beschreibung: Author(s): Wojciech Kasperek, Piotr Kubala, and Michał Cieśla This study presents an algorithm to generate a saturated random packing built of identical, unoriented rectangles. The algorithm is based on tracing regions that are unavailable for placing subsequent shapes. If these regions cover the whole packing the algorithm stops because no more objects can be... [Phys. Rev. E 98, 063310] Published Mon Dec 17, 2018

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Half-range lattice Boltzmann models for the simulation of Couette flow using the Shakhov collision term (2018)

Victor E. Ambruş and Victor Sofonea

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-12-18

Beschreibung: Author(s): Victor E. Ambruş and Victor Sofonea The three-dimensional Couette flow between parallel plates is addressed using mixed lattice Boltzmann models which implement the half-range and the full-range Gauss-Hermite quadratures on the Cartesian axes perpendicular and parallel to the walls, respectively. The ability of our models to simulate ... [Phys. Rev. E 98, 063311] Published Mon Dec 17, 2018

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Quantum Groups as Hidden Symmetries of Quantum Impurities (2018)

E. Yakaboylu, M. Shkolnikov, and M. Lemeshko

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-18

Beschreibung: Author(s): E. Yakaboylu, M. Shkolnikov, and M. Lemeshko We present an approach to interacting quantum many-body systems based on the notion of quantum groups, also known as q -deformed Lie algebras. In particular, we show that, if the symmetry of a free quantum particle corresponds to a Lie group G , in the presence of a many-body environment this particle... [Phys. Rev. Lett. 121, 255302] Published Mon Dec 17, 2018

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Separation of Elastic and Plastic Timescales in a Phase Field Crystal Model (2018)

Audun Skaugen, Luiza Angheluta, and Jorge Viñals

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-18

Beschreibung: Author(s): Audun Skaugen, Luiza Angheluta, and Jorge Viñals A consistent small-scale description of plasticity and dislocation motion in a crystalline solid is presented based on the phase field crystal description. By allowing for independent mass motion and lattice distortion, the crystal can maintain elastic equilibrium on the timescale of plastic motion.... [Phys. Rev. Lett. 121, 255501] Published Mon Dec 17, 2018

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Connecting the Simpler Structures to Topologically Close-Packed Phases (2018)

Anirudh Raju Natarajan and Anton Van der Ven

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-18

Beschreibung: Author(s): Anirudh Raju Natarajan and Anton Van der Ven Pathways connecting dissimilar crystal structures are fundamental to our understanding of structural phase transitions. In this Letter, we report on a new pathway connecting the hexagonal close-packed crystal structure to a hierarchy of topologically close-packed phases consisting of kagome and tria... [Phys. Rev. Lett. 121, 255701] Published Mon Dec 17, 2018

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Extrapolating Quantum Observables with Machine Learning: Inferring Multiple Phase Transitions from Properties of a Single Phase (2018)

Rodrigo A. Vargas-Hernández, John Sous, Mona Berciu, and Roman V. Krems

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-18

Beschreibung: Author(s): Rodrigo A. Vargas-Hernández, John Sous, Mona Berciu, and Roman V. Krems We present a machine-learning method for predicting sharp transitions in a Hamiltonian phase diagram by extrapolating the properties of quantum systems. The method is based on Gaussian process regression with a combination of kernels chosen through an iterative procedure maximizing the predicting po... [Phys. Rev. Lett. 121, 255702] Published Mon Dec 17, 2018

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Three-Dimensional Shapes of Spinning Helium Nanodroplets (2018)

Bruno Langbehn et al.

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-18

Beschreibung: Author(s): Bruno Langbehn et al. A significant fraction of superfluid helium nanodroplets produced in a free-jet expansion has been observed to gain high angular momentum resulting in large centrifugal deformation. We measured single-shot diffraction patterns of individual rotating helium nanodroplets up to large scattering angles ... [Phys. Rev. Lett. 121, 255301] Published Mon Dec 17, 2018

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Orbital-Flop Transition of Angular Momentum in a Topological Superfluid (2018)

A. M. Zimmerman, J. I. A. Li, M. D. Nguyen, and W. P. Halperin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-19

Beschreibung: Author(s): A. M. Zimmerman, J. I. A. Li, M. D. Nguyen, and W. P. Halperin The direction of the orbital angular momentum of the B phase of superfluid He 3 can be controlled by engineering the anisotropy of the silica aerogel framework within which it is imbibed. In this work, we report our discovery of an unusual and abrupt “orbital-flop” transition of the superfluid angula... [Phys. Rev. Lett. 121, 255303] Published Tue Dec 18, 2018

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Three-Dimensional Imaging of Phase Ordering in an Fe-Al Alloy by Bragg Ptychography (2018)

Chan Kim, Virginie Chamard, Jörg Hallmann, Thomas Roth, Wei Lu, Ulrike Boesenberg, Alexey Zozulya, Steven Leake, and Anders Madsen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-20

Beschreibung: Author(s): Chan Kim, Virginie Chamard, Jörg Hallmann, Thomas Roth, Wei Lu, Ulrike Boesenberg, Alexey Zozulya, Steven Leake, and Anders Madsen We show three-dimensional images of phase ordering in a Fe 55 Al 45 alloy obtained by coherent x-ray diffraction Bragg ptychography. Fe-Al alloys display ordered phases where the atoms organize on sublattices resulting in the emergence of otherwise forbidden superlattice reflections. The degeneracy of ... [Phys. Rev. Lett. 121, 256101] Published Wed Dec 19, 2018

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Interplay between Phonons and Anisotropic Elasticity Drives Negative Thermal Expansion in ${\mathrm{PbTiO}}_{3}$ (2018)

Ethan T. Ritz and Nicole A. Benedek

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-20

Beschreibung: Author(s): Ethan T. Ritz and Nicole A. Benedek We use first-principles theory to show that the ingredients assumed to be essential to the occurrence of negative thermal expansion (NTE)—rigid unit phonon modes with negative Grüneisen parameters—are neither sufficient nor necessary for a material to undergo NTE. Instead, we find that NTE in PbTiO 3 ... [Phys. Rev. Lett. 121, 255901] Published Wed Dec 19, 2018

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Segregation-Induced Nanofaceting Transition at an Asymmetric Tilt Grain Boundary in Copper (2018)

Nicolas J. Peter, Timofey Frolov, Maria J. Duarte, Raheleh Hadian, Colin Ophus, Christoph Kirchlechner, Christian H. Liebscher, and Gerhard Dehm

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-21

Beschreibung: Author(s): Nicolas J. Peter, Timofey Frolov, Maria J. Duarte, Raheleh Hadian, Colin Ophus, Christoph Kirchlechner, Christian H. Liebscher, and Gerhard Dehm We show that chemistry can be used to trigger a nanofaceting transition. In particular, the segregation of Ag to an asymmetric tilt grain boundary in Cu is investigated. Aberration-corrected electron microscopy reveals that annealing the bicrystal results in the formation of nanometer-sized facets c... [Phys. Rev. Lett. 121, 255502] Published Thu Dec 20, 2018

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Accelerated Search and Design of Stretchable Graphene Kirigami Using Machine Learning (2018)

Paul Z. Hanakata, Ekin D. Cubuk, David K. Campbell, and Harold S. Park

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-21

Beschreibung: Author(s): Paul Z. Hanakata, Ekin D. Cubuk, David K. Campbell, and Harold S. Park Making kirigami-inspired cuts into a sheet has been shown to be an effective way of designing stretchable materials with metamorphic properties where the 2D shape can transform into complex 3D shapes. However, finding the optimal solutions is not straightforward as the number of possible cutting pat... [Phys. Rev. Lett. 121, 255304] Published Thu Dec 20, 2018

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Lattice Instability during Solid-Solid Structural Transformations under a General Applied Stress Tensor: Example of $\mathrm{Si}\text{ }\text{ }\mathrm{I}→\mathrm{Si}\text{ }\text{ }\mathrm{II}$ with Metallization (2018)

Nikolai A. Zarkevich, Hao Chen, Valery I. Levitas, and Duane D. Johnson

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-18

Beschreibung: Author(s): Nikolai A. Zarkevich, Hao Chen, Valery I. Levitas, and Duane D. Johnson The density functional theory was employed to study the stress-strain behavior and elastic instabilities during the solid-solid phase transformation (PT) when subjected to a general stress tensor, as exemplified for semiconducting Si I and metallic Si II, where metallization precedes the PT, so stre... [Phys. Rev. Lett. 121, 165701] Published Wed Oct 17, 2018

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Zener Tunneling Breakdown in Phase-Change Materials Revealed by Intense Terahertz Pulses (2018)

Yasuyuki Sanari, Takehiro Tachizaki, Yuta Saito, Kotaro Makino, Paul Fons, Alexander V. Kolobov, Junji Tominaga, Koichiro Tanaka, Yoshihiko Kanemitsu, Muneaki Hase, and Hideki Hirori

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-20

Beschreibung: Author(s): Yasuyuki Sanari, Takehiro Tachizaki, Yuta Saito, Kotaro Makino, Paul Fons, Alexander V. Kolobov, Junji Tominaga, Koichiro Tanaka, Yoshihiko Kanemitsu, Muneaki Hase, and Hideki Hirori We have systematically investigated the spatial and temporal dynamics of crystallization that occur in the phase-change material Ge 2 Sb 2 Te 5 upon irradiation with an intense terahertz (THz) pulse. THz-pump–optical-probe spectroscopy revealed that Zener tunneling induces a nonlinear increase in the con... [Phys. Rev. Lett. 121, 165702] Published Fri Oct 19, 2018

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Atomic Step Flow on a Nanofacet (2018)

Jean-Christophe Harmand, Gilles Patriarche, Frank Glas, Federico Panciera, Ileana Florea, Jean-Luc Maurice, Laurent Travers, and Yannick Ollivier

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-20

Beschreibung: Author(s): Jean-Christophe Harmand, Gilles Patriarche, Frank Glas, Federico Panciera, Ileana Florea, Jean-Luc Maurice, Laurent Travers, and Yannick Ollivier An electron microscope captures new atomic layers forming and spreading across the surface of a growing nanocrystal. [Phys. Rev. Lett. 121, 166101] Published Fri Oct 19, 2018

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Numerical inversion methods for recovering negative amplitudes in two-dimensional nuclear magnetic resonance relaxation-time correlations (2018)

Thusara C. Chandrasekera and Jonathan Mitchell

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-10-26

Beschreibung: Author(s): Thusara C. Chandrasekera and Jonathan Mitchell Two-dimensional nuclear magnetic resonance measurements are ubiquitous in the literature, with correlations of longitudinal T 1 and transverse T 2 relaxation times used extensively to characterize porous media. Decomposition of the signal acquired in the time domain to a pseudocontinuous distribution ... [Phys. Rev. E 98, 043308] Published Thu Oct 25, 2018

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Complex Low Energy Tetrahedral Polymorphs of Group IV Elements from First Principles (2018)

Chaoyu He, Xizhi Shi, S. J. Clark, Jin Li, Chris J. Pickard, Tao Ouyang, Chunxiao Zhang, Chao Tang, and Jianxin Zhong

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-27

Beschreibung: Author(s): Chaoyu He, Xizhi Shi, S. J. Clark, Jin Li, Chris J. Pickard, Tao Ouyang, Chunxiao Zhang, Chao Tang, and Jianxin Zhong The energy landscape of carbon is exceedingly complex, hosting diverse and important metastable phases, including diamond, fullerenes, nanotubes, and graphene. Searching for structures, especially those with large unit cells, in this landscape is challenging. Here we use a combined stochastic search... [Phys. Rev. Lett. 121, 175701] Published Fri Oct 26, 2018

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Phonon Angular Momentum Induced by the Temperature Gradient (2018)

Masato Hamada, Emi Minamitani, Motoaki Hirayama, and Shuichi Murakami

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-27

Beschreibung: Author(s): Masato Hamada, Emi Minamitani, Motoaki Hirayama, and Shuichi Murakami Phonon modes in crystals can have angular momenta in general. It nevertheless cancels in equilibrium when the time-reversal symmetry is preserved. In this Letter, we show that when a temperature gradient is applied and heat current flows in the crystal, the phonon distribution becomes off equilibriu... [Phys. Rev. Lett. 121, 175301] Published Fri Oct 26, 2018

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Recovering the past history of natural recording media by Bayesian inversion (2018)

Tatsu Kuwatani, Hiromichi Nagao, Shin-ichi Ito, Atsushi Okamoto, Kenta Yoshida, and Takamoto Okudaira

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-11-01

Beschreibung: Author(s): Tatsu Kuwatani, Hiromichi Nagao, Shin-ichi Ito, Atsushi Okamoto, Kenta Yoshida, and Takamoto Okudaira Spatial growth patterns are natural recording media (NRMs) that preserve important historical information, which can be accessed and analyzed to reconstruct past environmental conditions and events. Here, we propose the Bayesian inversion method, which can reconstruct the evolution of target paramet... [Phys. Rev. E 98, 043311] Published Wed Oct 31, 2018

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Random-Length Random Walks and Finite-Size Scaling in High Dimensions (2018)

Zongzheng Zhou, Jens Grimm, Sheng Fang, Youjin Deng, and Timothy M. Garoni

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-01

Beschreibung: Author(s): Zongzheng Zhou, Jens Grimm, Sheng Fang, Youjin Deng, and Timothy M. Garoni We address a long-standing debate regarding the finite-size scaling (FSS) of the Ising model in high dimensions, by introducing a random-length random walk model, which we then study rigorously. We prove that this model exhibits the same universal FSS behavior previously conjectured for the self-avo... [Phys. Rev. Lett. 121, 185701] Published Wed Oct 31, 2018

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Thermal Expansion of Single-Crystal ${\mathrm{H}}_{2}\mathrm{O}$ and ${\mathrm{D}}_{2}\mathrm{O}$ Ice Ih (2018)

David T. W. Buckingham, J. J. Neumeier, Sueli H. Masunaga, and Yi-Kuo Yu

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-03

Beschreibung: Author(s): David T. W. Buckingham, J. J. Neumeier, Sueli H. Masunaga, and Yi-Kuo Yu Thermal expansion of H 2 O and D 2 O ice Ih with relative resolution of 1 ppb is reported. A large transition in the thermal expansion coefficient at 101 K in H 2 O moves to 125 K in D 2 O , revealing one of the largest-known isotope effects. Rotational oscillatory modes that couple poorly to phonons, i.e., ... [Phys. Rev. Lett. 121, 185505] Published Fri Nov 02, 2018

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Information estimation using nonparametric copulas (2018)

Houman Safaai, Arno Onken, Christopher D. Harvey, and Stefano Panzeri

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-11-06

Beschreibung: Author(s): Houman Safaai, Arno Onken, Christopher D. Harvey, and Stefano Panzeri Estimation of mutual information between random variables has become crucial in a range of fields, from physics to neuroscience to finance. Estimating information accurately over a wide range of conditions relies on the development of flexible methods to describe statistical dependencies among varia... [Phys. Rev. E 98, 053302] Published Mon Nov 05, 2018

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Droplet Crystal Ground States of a Dipolar Bose Gas (2018)

D. Baillie and P. B. Blakie

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-10

Beschreibung: Author(s): D. Baillie and P. B. Blakie We show that the ground state of a dipolar Bose gas in a cylindrically symmetric harmonic trap has a rich phase diagram, including droplet crystal states in which a set of droplets arrange into a lattice pattern that breaks the rotational symmetry. An analytic model for small droplet crystals is dev... [Phys. Rev. Lett. 121, 195301] Published Fri Nov 09, 2018

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Ideal Glass States Are Not Purely Vibrational: Insight from Randomly Pinned Glasses (2018)

Misaki Ozawa, Atsushi Ikeda, Kunimasa Miyazaki, and Walter Kob

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-15

Beschreibung: Author(s): Misaki Ozawa, Atsushi Ikeda, Kunimasa Miyazaki, and Walter Kob We use computer simulations to probe the thermodynamic and dynamic properties of a glass former that undergoes an ideal glass transition because of the presence of randomly pinned particles. We find that even deep in the equilibrium glass state, the system relaxes to some extent because of the prese... [Phys. Rev. Lett. 121, 205501] Published Wed Nov 14, 2018

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Piezoelectric Mimicry of Flexoelectricity (2018)

Amir Abdollahi, Fabián Vásquez-Sancho, and Gustau Catalan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-16

Beschreibung: Author(s): Amir Abdollahi, Fabián Vásquez-Sancho, and Gustau Catalan The origin of “giant” flexoelectricity, orders of magnitude larger than theoretically predicted, yet frequently observed, is under intense scrutiny. There is mounting evidence correlating giant flexoelectriclike effects with parasitic piezoelectricity, but it is not clear how piezoelectricity (polar... [Phys. Rev. Lett. 121, 205502] Published Thu Nov 15, 2018

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Scale-Free Modeling of Coupled Evolution of Discrete Dislocation Bands and Multivariant Martensitic Microstructure (2018)

Valery I. Levitas, S. Ehsan Esfahani, and Iman Ghamarian

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-16

Beschreibung: Author(s): Valery I. Levitas, S. Ehsan Esfahani, and Iman Ghamarian A scale-free model for the coupled evolution of discrete dislocation bands and multivariant martensitic microstructure is developed. In contrast to previous phase field models, which are limited to nanoscale specimens, this model allows for treating the nucleation and evolution of martensite at evol... [Phys. Rev. Lett. 121, 205701] Published Thu Nov 15, 2018

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Hydrophobic Surface Enhances Electrostatic Interaction in Water (2018)

Takato Sato, Tohru Sasaki, Jun Ohnuki, Koji Umezawa, and Mitsunori Takano

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-16

Beschreibung: Author(s): Takato Sato, Tohru Sasaki, Jun Ohnuki, Koji Umezawa, and Mitsunori Takano A high dielectric constant is one of the peculiar properties of liquid water, indicating that the electrostatic interaction between charged substances is largely reduced in water. We show by molecular dynamics simulation that the dielectric constant of water is decreased near the hydrophobic surface... [Phys. Rev. Lett. 121, 206002] Published Thu Nov 15, 2018

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Water Dissociation and Hydroxyl Ordering on Anatase ${\mathrm{TiO}}_{2}(001)\text{−}(1×4)$ (2018)

Igor Beinik, Albert Bruix, Zheshen Li, Kræn C. Adamsen, Stig Koust, Bjørk Hammer, Stefan Wendt, and Jeppe V. Lauritsen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-16

Beschreibung: Author(s): Igor Beinik, Albert Bruix, Zheshen Li, Kræn C. Adamsen, Stig Koust, Bjørk Hammer, Stefan Wendt, and Jeppe V. Lauritsen We studied the interaction of water with the anatase TiO 2 ( 001 ) surface by means of scanning tunneling microscopy, x-ray photoelectron spectroscopy, and density functional theory calculations. Water adsorbs dissociatively on the ridges of a ( 1 × 4 ) reconstructed surface, resulting in a ( 3 × 4 ) periodic s... [Phys. Rev. Lett. 121, 206003] Published Thu Nov 15, 2018

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Efficient and quantitative analysis of photon density of states for two-dimensional photonic crystals with omnidirectional light propagation (2018)

Ruei-Fu Jao and Ming-Chieh Lin

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-11-20

Beschreibung: Author(s): Ruei-Fu Jao and Ming-Chieh Lin Omnidirectional light propagation in two-dimensional (2D) photonic crystals (PCs) has been investigated by extending the formerly developed 2D finite element analysis (FEA) of in-plane light propagation in which the corresponding band structure (BS) and photon density of states (PDOS) of 2D PCs with... [Phys. Rev. E 98, 053306] Published Mon Nov 19, 2018

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Vanishing Density of States in Weakly Disordered Weyl Semimetals (2018)

Michael Buchhold, Sebastian Diehl, and Alexander Altland

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-20

Beschreibung: Author(s): Michael Buchhold, Sebastian Diehl, and Alexander Altland The Brillouin zone of the clean Weyl semimetal contains points at which the density of states (DOS) vanishes. Previous work suggested that below a certain critical concentration of impurities this feature is preserved including in the presence of disorder. This result got criticized for its neglect ... [Phys. Rev. Lett. 121, 215301] Published Mon Nov 19, 2018

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First-Principles Calculation of Third-Order Elastic Constants via Numerical Differentiation of the Second Piola-Kirchhoff Stress Tensor (2018)

Tengfei Cao, David Cuffari, and Angelo Bongiorno

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-22

Beschreibung: Author(s): Tengfei Cao, David Cuffari, and Angelo Bongiorno A general method is presented to calculate from first principles the full set of third-order elastic constants of a material of arbitrary symmetry. The method here illustrated relies on a plane-wave density functional theory scheme to calculate the Cauchy stress and the numerical differentiation of ... [Phys. Rev. Lett. 121, 216001] Published Wed Nov 21, 2018

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Introducing a quantum kinetic model using the generalized Boltzmann equation in the complex phase space (2018)

Abed Zadehgol and Reza Khazaeli

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-11-22

Beschreibung: Author(s): Abed Zadehgol and Reza Khazaeli In the present work, using the generalized Boltzmann equation of the first author [ Phys. Rev. E 94 , 023316 (2016) ], a quantum kinetic model in the complex phase space is proposed. Employing the Chapman-Enskog analysis and applying the Wick rotation (using complex-valued relaxation time), it is shown... [Phys. Rev. E 98, 053307] Published Wed Nov 21, 2018

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Optimization of population annealing Monte Carlo for large-scale spin-glass simulations (2018)

Amin Barzegar, Christopher Pattison, Wenlong Wang, and Helmut G. Katzgraber

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-11-22

Beschreibung: Author(s): Amin Barzegar, Christopher Pattison, Wenlong Wang, and Helmut G. Katzgraber Population annealing Monte Carlo is an efficient sequential algorithm for simulating k -local Boolean Hamiltonians. Because of its structure, the algorithm is inherently parallel and therefore well suited for large-scale simulations of computationally hard problems. Here we present various ways of op... [Phys. Rev. E 98, 053308] Published Wed Nov 21, 2018

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Controlled Ordering of Topological Charges in an Exciton-Polariton Chain (2018)

T. Gao, O. A. Egorov, E. Estrecho, K. Winkler, M. Kamp, C. Schneider, S. Höfling, A. G. Truscott, and E. A. Ostrovskaya

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): T. Gao, O. A. Egorov, E. Estrecho, K. Winkler, M. Kamp, C. Schneider, S. Höfling, A. G. Truscott, and E. A. Ostrovskaya We demonstrate, experimentally and theoretically, controlled loading of an exciton-polariton vortex chain into a 1D array of trapping potentials. Switching between two types of vortex chains, with topological charges of the same or alternating signs, is achieved by appropriately shaping an off-reson... [Phys. Rev. Lett. 121, 225302] Published Tue Nov 27, 2018

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Critical Vortex Shedding in a Strongly Interacting Fermionic Superfluid (2018)

Jee Woo Park, Bumsuk Ko, and Y. Shin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-29

Beschreibung: Author(s): Jee Woo Park, Bumsuk Ko, and Y. Shin We study the critical vortex shedding in a strongly interacting fermionic superfluid of Li 6 across the BEC-BCS crossover. By moving an optical obstacle in the sample and directly imaging the vortices after the time of flight, the critical velocity u vor for vortex shedding is measured as a function o... [Phys. Rev. Lett. 121, 225301] Published Wed Nov 28, 2018

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Simulating Ising and $n$-State Planar Potts Models and External Fields with Nonequilibrium Condensates (2018)

Kirill P. Kalinin and Natalia G. Berloff

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-05

Beschreibung: Author(s): Kirill P. Kalinin and Natalia G. Berloff Classical spin models with discrete or continuous degrees of freedom arise in many studies of complex physical systems. A wide class of hard real-life optimization problems can be formulated as a minimization of a spin Hamiltonian. Here we show how to simulate the discrete Ising and n -state planar P... [Phys. Rev. Lett. 121, 235302] Published Tue Dec 04, 2018

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Diagrammatic Monte Carlo Approach to Angular Momentum in Quantum Many-Particle Systems (2018)

G. Bighin, T. V. Tscherbul, and M. Lemeshko

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-10-17

Beschreibung: Author(s): G. Bighin, T. V. Tscherbul, and M. Lemeshko We introduce a diagrammatic Monte Carlo approach to angular momentum properties of quantum many-particle systems possessing a macroscopic number of degrees of freedom. The treatment is based on a diagrammatic expansion that merges the usual Feynman diagrams with the angular momentum diagrams known f... [Phys. Rev. Lett. 121, 165301] Published Tue Oct 16, 2018

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Rational hybrid Monte Carlo with block solvers and multiple pseudofermions (2018)

Philippe de Forcrand and Liam Keegan

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-10-19

Beschreibung: Author(s): Philippe de Forcrand and Liam Keegan The dominant cost of most lattice QCD simulations is the inversion of the Dirac operator required to calculate the force term in the rational hybrid Monte Carlo (RHMC) update. One way to improve this situation is to use multiple pseudofermions, which reduces the size and variance of this force and h... [Phys. Rev. E 98, 043306] Published Thu Oct 18, 2018

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Consistency and convergence of simulation schemes in information field dynamics (2018)

Martin Dupont and Torsten Enßlin

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-10-23

Beschreibung: Author(s): Martin Dupont and Torsten Enßlin We explore a new simulation scheme for partial differential equations (PDE's) called information field dynamics (IFD). Information field dynamics is a probabilistic numerics method that seeks to preserve the maximum amount of information about the field being simulated. It rests on Bayesian field in... [Phys. Rev. E 98, 043307] Published Mon Oct 22, 2018

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Three-dimensional porous structure reconstruction based on structural local similarity via sparse representation on micro-computed-tomography images (2018)

Yuzhu Wang, Ji-Youn Arns, Sheikh S. Rahman, and Christoph H. Arns

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-10-30

Beschreibung: Author(s): Yuzhu Wang, Ji-Youn Arns, Sheikh S. Rahman, and Christoph H. Arns A tomographic or image representation of three-dimensional (3D) porous media is a primary tool for the consistent correlation and prediction of multiple physical properties. For multiscale media a single imaging scale may not be sufficient, and a compromise between field of view and resolution is re... [Phys. Rev. E 98, 043310] Published Mon Oct 29, 2018

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Lattice Boltzmann method for conjugated heat and mass transfer with general interfacial conditions (2018)

Yu-Tong Mu, Zhao-Lin Gu, Pu He, and Wen-Quan Tao

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-10-30

Beschreibung: Author(s): Yu-Tong Mu, Zhao-Lin Gu, Pu He, and Wen-Quan Tao A general interfacial treatment for the transport process in multicomponent systems governed by the convection-diffusion equation, together with conjugated interfaces where continuity or discontinuity interfacial conditions with regard to the physical scalar and its flux exist, is developed using th... [Phys. Rev. E 98, 043309] Published Mon Oct 29, 2018

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Multiscale Energy Dissipation Mechanism in Tough and Self-Healing Hydrogels (2018)

Kunpeng Cui, Tao Lin Sun, Xiaobin Liang, Ken Nakajima, Ya Nan Ye, Liang Chen, Takayuki Kurokawa, and Jian Ping Gong

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-01

Beschreibung: Author(s): Kunpeng Cui, Tao Lin Sun, Xiaobin Liang, Ken Nakajima, Ya Nan Ye, Liang Chen, Takayuki Kurokawa, and Jian Ping Gong Understanding the energy dissipation mechanism during deformation is essential for the design and application of tough soft materials. We show that, in a class of tough and self-healing polyampholyte hydrogels, a bicontinuous network structure, consisting of a hard network and a soft network, is for... [Phys. Rev. Lett. 121, 185501] Published Wed Oct 31, 2018

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Microscopic Theory of Two-Step Yielding in Attractive Colloids (2018)

Ada Altieri, Pierfrancesco Urbani, and Francesco Zamponi

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-03

Beschreibung: Author(s): Ada Altieri, Pierfrancesco Urbani, and Francesco Zamponi Attractive colloids display two distinct amorphous solid phases: the attractive glass due to particle bonding and the repulsive glass due to the hard-core repulsion. By means of a microscopic mean field approach, we analyze their response to a quasistatic shear strain. We find that the presence of t... [Phys. Rev. Lett. 121, 185503] Published Fri Nov 02, 2018

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Crack Front Interaction with Self-Emitted Acoustic Waves (2018)

D. Massy, F. Mazen, D. Landru, N. Ben Mohamed, S. Tardif, A. Reinhardt, F. Madeira, O. Kononchuk, and F. Rieutord

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-06

Beschreibung: Author(s): D. Massy, F. Mazen, D. Landru, N. Ben Mohamed, S. Tardif, A. Reinhardt, F. Madeira, O. Kononchuk, and F. Rieutord The acoustic waves emitted by a propagating crack can affect the crack’s motion and the marks it leaves behind. [Phys. Rev. Lett. 121, 195501] Published Mon Nov 05, 2018

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Introducing unsteady and nonuniform source terms in entropic lattice kinetic models using Fourier series (2018)

Reza Khazaeli, Mohammad Reza Nazari, and Abed Zadehgol

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-11-07

Beschreibung: Author(s): Reza Khazaeli, Mohammad Reza Nazari, and Abed Zadehgol In this work, for the constant speed kinetic model (CSKM) of Zadehgol and Ashrafizaadeh [ J. Comput. Phys. 274 , 803 (2014) ], a different nonuniform and unsteady mass and force source term is proposed. Employing a Fourier series expansion of the source term and applying the standard Chapnan-Enskog ana... [Phys. Rev. E 98, 053303] Published Tue Nov 06, 2018

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Machine-learning solver for modified diffusion equations (2018)

Qianshi Wei, Ying Jiang, and Jeff Z. Y. Chen

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-11-07

Beschreibung: Author(s): Qianshi Wei, Ying Jiang, and Jeff Z. Y. Chen A feedforward neural network has a remarkable property which allows the network itself to be a universal approximator for any function. Here we present a universal machine-learning based solver for multivariable partial differential equations. The algorithm approximates the target functions by neura... [Phys. Rev. E 98, 053304] Published Tue Nov 06, 2018

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Melting Si: Beyond Density Functional Theory (2018)

Florian Dorner, Zoran Sukurma, Christoph Dellago, and Georg Kresse

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-07

Beschreibung: Author(s): Florian Dorner, Zoran Sukurma, Christoph Dellago, and Georg Kresse The melting point of silicon in the cubic diamond phase is calculated using the random phase approximation (RPA). The RPA includes exact exchange as well as an approximate treatment of local as well as nonlocal many body correlation effects of the electrons. We predict a melting temperature of about... [Phys. Rev. Lett. 121, 195701] Published Tue Nov 06, 2018

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Preconditioned multiple-relaxation-time lattice Boltzmann equation model for incompressible flow in porous media (2018)

Xuhui Meng, Liang Wang, Xiaofan Yang, and Zhaoli Guo

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): Xuhui Meng, Liang Wang, Xiaofan Yang, and Zhaoli Guo An improved preconditioned multiple-relaxation-time lattice Boltzmann equation model for incompressible flow (IPMRT-LBE) in porous media is proposed. Motivated by previous LBE models [Guo et al. , Phys. Rev. E 70 , 066706 (2004) ; Premnath et al. , J. Comput. Phys. 228 , 746 (2009) ; Guo et al. , J. Com... [Phys. Rev. E 98, 053309] Published Tue Nov 27, 2018

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Percolation through Voids around Randomly Oriented Polyhedra and Axially Symmetric Grains (2018)

D. J. Priour, Jr. and N. J. McGuigan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-28

Beschreibung: Author(s): D. J. Priour, Jr. and N. J. McGuigan Percolation thresholds for randomly oriented interpenetrating polyhedra were calculated for each of the five Platonic solids, from tetrahedra to icosahedra, and it was determined that only for cubic grains does orientational disorder affect the percolation threshold. [Phys. Rev. Lett. 121, 225701] Published Tue Nov 27, 2018

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Higher-order lattice Boltzmann model for thermohydrodynamics (2018)

Mohammad Atif, Manjusha Namburi, and Santosh Ansumali

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-11-30

Beschreibung: Author(s): Mohammad Atif, Manjusha Namburi, and Santosh Ansumali We present an energy conserving lattice Boltzmann model on a body-centered-cubic arrangement for thermohydrodynamics. It exhibits accurate thermohydrodynamic behavior with a high degree of accuracy and is therefore capable of simulating compressible and thermal hydrodynamics. The theoretical require... [Phys. Rev. E 98, 053311] Published Thu Nov 29, 2018

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Mass Flow through Solid $^{3}\mathrm{He}$ in the bcc Phase (2018)

Zhi Gang Cheng and John Beamish

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-11-30

Beschreibung: Author(s): Zhi Gang Cheng and John Beamish A number of experiments have shown that mass can be transported through solid He 4 at temperatures as low as 16 mK, with features that suggest superflow. But the nature of this flow remains unclear. The Fermi isotope He 3 provides the possibility of a direct comparison to a solid in which quantum effe... [Phys. Rev. Lett. 121, 225304] Published Thu Nov 29, 2018

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Venture into Water’s No Man’s Land: Structural Transformations of Solid ${\mathbf{H}}_{\mathbf{2}}\mathrm{O}$ under Rapid Compression and Decompression (2018)

Chuanlong Lin, Jesse S. Smith, Xuqiang Liu, John S. Tse, and Wenge Yang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-01

Beschreibung: Author(s): Chuanlong Lin, Jesse S. Smith, Xuqiang Liu, John S. Tse, and Wenge Yang Pressure-induced formation of amorphous ices and the low-density amorphous (LDA) to high-density amorphous (HDA) transition have been believed to occur kinetically below a crossover temperature ( T c ) above which thermodynamically driven crystalline-crystalline (e.g., ice I h -to-II) transitions and cry... [Phys. Rev. Lett. 121, 225703] Published Fri Nov 30, 2018

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Glasslike Dynamics of Polar Domain Walls in Cryogenic ${\mathrm{SrTiO}}_{3}$ (2018)

David Pesquera, Michael A. Carpenter, and Ekhard K. H. Salje

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-04

Beschreibung: Author(s): David Pesquera, Michael A. Carpenter, and Ekhard K. H. Salje Polar and highly mobile domain walls in SrTiO 3 move under electric and elastic fields. Two vastly different timescales dominate their dynamical behavior. The previously observed fast changes lead to anomalies near 40 K where the elastic moduli soften and the polarity of the walls becomes strong. Kee... [Phys. Rev. Lett. 121, 235701] Published Mon Dec 03, 2018

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Variational Principle for Mass Transport (2018)

Dallas R. Trinkle

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-04

Beschreibung: Author(s): Dallas R. Trinkle A new theory provides a way to compare the accuracy of different mass-transport calculations, which are widely used to evaluate the performance of materials. [Phys. Rev. Lett. 121, 235901] Published Mon Dec 03, 2018

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Symmetry-Enriched Fracton Phases from Supersolid Duality (2018)

Michael Pretko and Leo Radzihovsky

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-04

Beschreibung: Author(s): Michael Pretko and Leo Radzihovsky Motivated by the recently established duality between elasticity of crystals and a fracton tensor gauge theory, we combine it with boson-vortex duality, to explicitly account for bosonic statistics of the underlying atoms. We thereby derive a hybrid vector-tensor gauge dual of a supersolid, which fe... [Phys. Rev. Lett. 121, 235301] Published Mon Dec 03, 2018

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Bose Condensation of Long-Living Direct Excitons in an Off-Resonant Cavity (2018)

N. S. Voronova, I. L. Kurbakov, and Yu. E. Lozovik

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-05

Beschreibung: Author(s): N. S. Voronova, I. L. Kurbakov, and Yu. E. Lozovik We propose a way to increase the lifetime of two-dimensional direct excitons and show the possibility to observe their macroscopically coherent state at temperatures much higher than that of indirect exciton condensation. For a single GaAs quantum well embedded in photonic layered heterostructures w... [Phys. Rev. Lett. 121, 235702] Published Tue Dec 04, 2018

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Crystal nucleation along an entropic pathway: Teaching liquids how to transition (2018)

Caroline Desgranges and Jerome Delhommelle

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-12-11

Beschreibung: Author(s): Caroline Desgranges and Jerome Delhommelle We combine machine learning (ML) with Monte Carlo (MC) simulations to study the crystal nucleation process. Specifically, we use ML to infer the canonical partition function of the system over the range of densities and temperatures spanned during crystallization. We achieve this on the example of t... [Phys. Rev. E 98, 063307] Published Mon Dec 10, 2018

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Orientational Distribution of Free O-H Groups of Interfacial Water is Exponential (2018)

Shumei Sun, Fujie Tang, Sho Imoto, Daniel R. Moberg, Tatsuhiko Ohto, Francesco Paesani, Mischa Bonn, Ellen H. G. Backus, and Yuki Nagata

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-11

Beschreibung: Author(s): Shumei Sun, Fujie Tang, Sho Imoto, Daniel R. Moberg, Tatsuhiko Ohto, Francesco Paesani, Mischa Bonn, Ellen H. G. Backus, and Yuki Nagata The orientational distribution of free O-H (O-D) groups at the H 2 O - ( D 2 O -)air interface is investigated using combined molecular dynamics (MD) simulations and sum-frequency generation (SFG) experiments. The average angle of the free O-H groups, relative to the surface normal, is found to be ∼ 63 ° , su... [Phys. Rev. Lett. 121, 246101] Published Mon Dec 10, 2018

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Saturated packings of convex anisotropic objects under random sequential adsorption protocol (2018)

Karol Haiduk, Piotr Kubala, and Michał Cieśla

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-12-12

Beschreibung: Author(s): Karol Haiduk, Piotr Kubala, and Michał Cieśla The paper presents an algorithm to generate two-dimensional, saturated random sequential adsorption packings of identical, unoriented, anisotropic convex shapes. The method consists in tracking regions where the next shape can be added. The algorithm was tested on packings built of spherocylinders a... [Phys. Rev. E 98, 063309] Published Tue Dec 11, 2018

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Liquid Structure of Shock-Compressed Hydrocarbons at Megabar Pressures (2018)

N. J. Hartley, J. Vorberger, T. Döppner, T. Cowan, R. W. Falcone, L. B. Fletcher, S. Frydrych, E. Galtier, E. J. Gamboa, D. O. Gericke, S. H. Glenzer, E. Granados, M. J. Mac; Donald, A. J. Mac; Kinnon, E. E. McBride, I. Nam, P. Neumayer, A. Pak, K. Rohatsch, A. M. Saunders, A. K. Schuster, P. Sun, T. van Driel, and D. Kraus

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-12-15

Beschreibung: Author(s): N. J. Hartley, J. Vorberger, T. Döppner, T. Cowan, R. W. Falcone, L. B. Fletcher, S. Frydrych, E. Galtier, E. J. Gamboa, D. O. Gericke, S. H. Glenzer, E. Granados, M. J. MacDonald, A. J. MacKinnon, E. E. McBride, I. Nam, P. Neumayer, A. Pak, K. Rohatsch, A. M. Saunders, A. K. Schuster, P. Sun, T. van Driel, and D. Kraus We present results for the ionic structure in hydrocarbons (polystyrene, polyethylene) that were shock compressed to pressures of up to 190 GPa, inducing rapid melting of the samples. The structure of the resulting liquid is then probed using in situ diffraction by an x-ray free electron laser beam,... [Phys. Rev. Lett. 121, 245501] Published Fri Dec 14, 2018

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Single-component multiphase lattice Boltzmann simulation of free bubble and crevice heterogeneous cavitation nucleation (2018)

Chi Peng, Shouceng Tian, Gensheng Li, and Michael C. Sukop

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-08-14

Beschreibung: Author(s): Chi Peng, Shouceng Tian, Gensheng Li, and Michael C. Sukop This work serves as an important extension of previous work on cavitation simulation [Sukop and Or, Phys. Rev. E 71 , 046703 (2005) ]. A modified Shan-Chen single-component multiphase lattice Boltzmann method is used to simulate two different heterogeneous cavitation nucleation mechanisms, the free ga... [Phys. Rev. E 98, 023305] Published Mon Aug 13, 2018

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Unusual Proton Transfer Kinetics in Water at the Temperature of Maximum Density (2018)

Emilia V. Silletta, Mark E. Tuckerman, and Alexej Jerschow

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-14

Beschreibung: Author(s): Emilia V. Silletta, Mark E. Tuckerman, and Alexej Jerschow Water exhibits numerous anomalous properties, many of which remain poorly understood. One of its intriguing behaviors is that it exhibits a temperature of maximum density (TMD) at 4 ° C . We provide here new experimental evidence for hitherto unknown abrupt changes in proton transfer kinetics at the T... [Phys. Rev. Lett. 121, 076001] Published Mon Aug 13, 2018

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Experimental Observation of Aharonov-Bohm Cages in Photonic Lattices (2018)

Sebabrata Mukherjee, Marco Di Liberto, Patrik Öhberg, Robert R. Thomson, and Nathan Goldman

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-17

Beschreibung: Author(s): Sebabrata Mukherjee, Marco Di Liberto, Patrik Öhberg, Robert R. Thomson, and Nathan Goldman We report on the experimental realization of a uniform synthetic magnetic flux and the observation of Aharonov-Bohm cages in photonic lattices. Considering a rhombic array of optical waveguides, we engineer modulation-assisted tunneling processes that effectively produce nonzero magnetic flux per pl... [Phys. Rev. Lett. 121, 075502] Published Thu Aug 16, 2018

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How Does a Locally Constrained Quantum System Localize? (2018)

Chun Chen, Fiona Burnell, and Anushya Chandran

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-21

Beschreibung: Author(s): Chun Chen, Fiona Burnell, and Anushya Chandran At low energy, the dynamics of excitations of many physical systems are locally constrained. Examples include frustrated antiferromagnets, fractional quantum Hall fluids, and Rydberg atoms in the blockaded regime. Can such locally constrained systems be fully many-body localized? In this Letter, we ... [Phys. Rev. Lett. 121, 085701] Published Mon Aug 20, 2018

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Dislocation Networks and the Microstructural Origin of Strain Hardening (2018)

Ryan B. Sills, Nicolas Bertin, Amin Aghaei, and Wei Cai

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-21

Beschreibung: Author(s): Ryan B. Sills, Nicolas Bertin, Amin Aghaei, and Wei Cai When metals plastically deform, the density of line defects called dislocations increases and the microstructure is continuously refined, leading to the strain hardening behavior. Using discrete dislocation dynamics simulations, we demonstrate the fundamental role of junction formation in connecting... [Phys. Rev. Lett. 121, 085501] Published Mon Aug 20, 2018

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Phase-field model for growth and dissolution of a stoichiometric compound in a binary liquid (2018)

Hitoshi Miura

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-08-28

Beschreibung: Author(s): Hitoshi Miura We propose a simple formulation of the phase-field model for a stoichiometric compound growing in a binary liquid. In previous models, chemical free energies of stoichiometric compounds have been approximated by parabolic functions of composition; however, the curvature has been determined arbitrari... [Phys. Rev. E 98, 023311] Published Mon Aug 27, 2018

Schlagwort(e): Computational Physics

Print ISSN: 1539-3755

Digitale ISSN: 1550-2376

Thema: Physik

Publiziert von American Physical Society (APS)

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Ryan L. Melvin, Jiajie Xiao, Kenneth S. Berenhaut, Ryan C. Godwin, and Freddie R. Salsbury, Jr.

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): Ryan L. Melvin, Jiajie Xiao, Kenneth S. Berenhaut, Ryan C. Godwin, and Freddie R. Salsbury, Jr. Here we present a time-dependent correlation method that provides insight into how long a system takes to grow into its equal-time (Pearson) correlation. We also show a usage of an extant time-lagged correlation method that indicates the time for parts of a system to become decorrelated, relative to... [Phys. Rev. E 98, 023307] Published Fri Aug 24, 2018

Schlagwort(e): Computational Physics

Print ISSN: 1539-3755

Digitale ISSN: 1550-2376

Thema: Physik

Publiziert von American Physical Society (APS)

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99

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Grand-potential-based phase-field model for multiple phases, grains, and chemical components (2018)

Larry K. Aagesen, Yipeng Gao, Daniel Schwen, and Karim Ahmed

American Physical Society (APS)

In: Physical Review E

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Publikationsdatum: 2018-08-25

Beschreibung: Author(s): Larry K. Aagesen, Yipeng Gao, Daniel Schwen, and Karim Ahmed Grand-potential-based phase-field model for multiple phases, grains, and chemical components is derived from a grand-potential functional. Due to the grand-potential formulation, the chemical energy does not contribute to the interfacial energy between phases, simplifying parametrization and decoupl... [Phys. Rev. E 98, 023309] Published Fri Aug 24, 2018

Schlagwort(e): Computational Physics

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Thema: Physik

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Quantum Relaxation and Metastability of Lattice Bosons with Cavity-Induced Long-Range Interactions (2018)

Benjamin Blaß, Heiko Rieger, Gergő Roósz, and Ferenc Iglói

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2018-08-29

Beschreibung: Author(s): Benjamin Blaß, Heiko Rieger, Gergő Roósz, and Ferenc Iglói The coupling of cold atoms to the radiation field within a high-finesse optical resonator, an optical cavity, induces long-range interactions which can compete with an underlying optical lattice. The interplay between short- and long-range interactions gives rise to new phases of matter including su... [Phys. Rev. Lett. 121, 095301] Published Tue Aug 28, 2018

Schlagwort(e): Condensed Matter: Structure, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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