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The exotic ground state of the decorated honeycomb lattice 装饰蜂巢晶格的奇异基态
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022369
O. O. Kryvchikov, D. V. Laptiev
{"title":"The exotic ground state of the decorated honeycomb lattice","authors":"O. O. Kryvchikov, D. V. Laptiev","doi":"10.1063/10.0022369","DOIUrl":"https://doi.org/10.1063/10.0022369","url":null,"abstract":"The study is focusing on the exploration of the magnetic properties of the frustrated decorated honeycomb lattices. The presence of geometrical frustration and C3 symmetry leads to an exotic ground state. Monte Carlo simulations and analytical calculations are used to analyze the system’s behavior. The dependence of the magnetization on the external field of the Ising model exhibits a step-like behavior, while the magnetization of the classical Heisenberg model has no plateau in the isotropic case. An efficient Hamiltonian is proposed to describe the properties of this system on the unfrustrated hexagonal lattice within the framework of the chiral Potts model. Within a specific range of fields, the state of the effective Hamiltonian aligns with that of the original Hamiltonian. The ground state configurations and degeneracy of the system are explored, revealing fractured stripe patterns separated by spins with opposite orientations. These findings contribute to the knowledge of the properties of decorated lattices, offering valuable insights for potential experimental and practical applications.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"31 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138632643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Two-dimensional electron gases as non-Newtonian fluids 作为非牛顿流体的二维电子气体
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022366
Serhii Kryhin, Leonid Levitov
{"title":"Two-dimensional electron gases as non-Newtonian fluids","authors":"Serhii Kryhin, Leonid Levitov","doi":"10.1063/10.0022366","DOIUrl":"https://doi.org/10.1063/10.0022366","url":null,"abstract":"Two-dimensional electron systems offer an appealing platform to explore long-lived excitations arising due to collinear carrier scattering enabled by phase-space constraints at the Fermi surface. Recently it was found that these effects can boost excitation lifetimes over the fundamental bound set by Landau’s Fermi-liquid theory by a factor as large as (TF/T)α with α≈2. Long-lived degrees of freedom possess the capability to amplify the response to weak perturbations, producing lasting collective memory effects. This leads to non-Newtonian hydrodynamics in 2D electron fluids driven by multiple viscous modes with scale-dependent viscosity. We describe these modes as Fermi surface modulations of odd parity evolving in space and time, and discuss their implications for experimental studies of electron hydrodynamics.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"50 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138627871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamics of skyrmion contraction and expansion in a magnetic film 磁性薄膜中的天融收缩和膨胀动力学
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022367
Eugene M. Chudnovsky
{"title":"Dynamics of skyrmion contraction and expansion in a magnetic film","authors":"Eugene M. Chudnovsky","doi":"10.1063/10.0022367","DOIUrl":"https://doi.org/10.1063/10.0022367","url":null,"abstract":"Contraction and expansion of skyrmions in ferromagnetic films are investigated. In centrosymmetric systems, the dynamics of a collapsing skyrmion is driven by dissipation. The collapse time has a minimum on the damping constant. In systems with broken inversion symmetry, the evolution of skyrmions toward equilibrium size is driven by the Dzyaloshinskii–Moriya interaction. Expressions describing the time dependence of the skyrmion size are derived and their implications for skyrmion-based information processing are discussed.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"152 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138627839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Transport signatures of plasmon fluctuations in electron hydrodynamics 电子流体力学中等离子波动的传输特征
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022363
Dmitry Zverevich, Alex Levchenko
{"title":"Transport signatures of plasmon fluctuations in electron hydrodynamics","authors":"Dmitry Zverevich, Alex Levchenko","doi":"10.1063/10.0022363","DOIUrl":"https://doi.org/10.1063/10.0022363","url":null,"abstract":"In two-dimensional electron systems, plasmons are gapless and long-lived collective excitations of propagating charge density oscillations. We study the fluctuation mechanism of plasmon-assisted transport in the regime of electron hydrodynamics. We consider pristine electron liquids where charge fluctuations are thermally induced by viscous stresses and intrinsic currents, while attenuation of plasmons is determined by the Maxwell mechanism of charge relaxation. It is shown that, while the contribution of plasmons to the shear viscosity and thermal conductivity of a Fermi liquid is small, plasmon resonances in the bilayer devices enhance the drag resistance. In systems without Galilean invariance, fluctuation-driven contributions to dissipative coefficients can be described only in terms of hydrodynamic quantities: intrinsic conductivity, viscosity, and plasmon dispersion relation.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"262 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138632644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hydrodynamic Navier-Stokes equations in two-dimensional systems with Rashba spin-orbit coupling 具有拉什巴自旋轨道耦合的二维系统中的水动力学纳维-斯托克斯方程
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022364
Edvin G. Idrisov, Eddwi H. Hasdeo, Byjesh N. Radhakrishnan, Thomas L. Schmidt
{"title":"Hydrodynamic Navier-Stokes equations in two-dimensional systems with Rashba spin-orbit coupling","authors":"Edvin G. Idrisov, Eddwi H. Hasdeo, Byjesh N. Radhakrishnan, Thomas L. Schmidt","doi":"10.1063/10.0022364","DOIUrl":"https://doi.org/10.1063/10.0022364","url":null,"abstract":"We study a two-dimensional (2D) electron system with a linear spectrum in the presence of Rashba spin-orbit (RSO) coupling in the hydrodynamic regime. We derive a semiclassical Boltzmann equation with a collision integral due to Coulomb interactions on the basis of the eigenstates of the system with RSO coupling. Using the local equilibrium distribution functions, we obtain a generalized hydrodynamic Navier–Stokes equation for electronic systems with RSO coupling. In particular, we discuss the influence of the spin-orbit coupling on the viscosity and the enthalpy of the system and present some of its observable effects in hydrodynamic transport.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"3 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138627985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal conductivity in one-dimensional electronic fluids 一维电子流体的导热性
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022362
D. B. Gutman, I. V. Protopopov, R. Samanta, A. D. Mirlin
{"title":"Thermal conductivity in one-dimensional electronic fluids","authors":"D. B. Gutman, I. V. Protopopov, R. Samanta, A. D. Mirlin","doi":"10.1063/10.0022362","DOIUrl":"https://doi.org/10.1063/10.0022362","url":null,"abstract":"We study thermal conductivity in one-dimensional electronic fluids combining kinetic [R. Samanta, I. V. Protopopov, A. D. Mirlin, and D. B. Gutman, Thermal transport in one-dimensional electronic fluid, Phys. Rev. Lett. 122, 206801 (2019)] and hydrodynamic [I. V. Protopopov, R. Samanta, A. D. Mirlin, and D. B. Gutman, Anomalous hydrodynamics in one-dimensional electronic fluid, Phys. Rev. Lett. 126, 256801 (2021)] theories. The kinetic approach is developed by partitioning the Hilbert space into bosonic and fermionic sectors. We focus on the regime where the long-living thermal excitations are fermions and compute thermal conductivity. From the kinetic theory standpoint, the fermionic part of thermal conductivity is normal, while the bosonic one is anomalous, that scales as ω–1/3 and thus dominates in the infrared limit. The multi-mode hydrodynamic theory is obtained by projecting the fermionic kinetic equation on the zero modes of its collision integral. On a bare level, both theories agree and the thermal conductivity computed in hydrodynamic theory matches the result of the kinetic equation. The interaction between hydrodynamic modes leads to renormalization and consequently to anomalous scaling of the transport coefficients. In a four-mode regime, all modes are ballistic and the anomaly manifests itself in Kardar-Parisi-Zhang-like broadening with asymmetric power-law tails. “Heads” and “tails” of the pulses contribute equally to thermal conductivity, leading to ω–1/3 scaling of heat conductivity. In the three-mode regime, the system is in the universality class of a classical viscous fluid [Herbert Spohn, Nonlinear fluctuating hydrodynamics for anharmonic chains, J. Stat. Phys. 154, 1191 (2014); O. Narayan and S. Ramaswamy, Anomalous heat conduction in one-dimensional momentum-conserving systems, Phys. Rev. Lett. 89, 200601 (2002)].","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"221 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138627991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adenine’s band strength at cryogenic temperatures 腺嘌呤在低温下的带强度
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022371
V. P. Rego, P. R. B. Oliveira, E. F. da Silveira
{"title":"Adenine’s band strength at cryogenic temperatures","authors":"V. P. Rego, P. R. B. Oliveira, E. F. da Silveira","doi":"10.1063/10.0022371","DOIUrl":"https://doi.org/10.1063/10.0022371","url":null,"abstract":"Infrared observations of the interstellar medium have unveiled the existence of numerous solid-phase molecules. The recent detection of uracil within the (162173) Ryugu asteroid has opened new prospects for the discovery of additional compounds, including nitrogenous bases, in the near future. To facilitate the comprehension, identification, and observation of these substances within astrophysical environments, precise measurements of their infrared band strengths are crucial. In this study, we present the outcomes of laboratory experiments conducted to investigate the behavior of adenine at various temperatures. The measured band strength from 3600 to 1970 cm−1 was determined to be 3.21⋅10−16 cm molecule−1. Additionally, as the temperature decreased, its behavior exhibited a well-fitted second-degree polynomial function. Notably, the experiments indicated no permanent phase changes or hysteresis during the cool-down and warm-up processes, further elucidating the thermal properties of adenine.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"101 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138632493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of electron-electron collisions on entrance potential drop in high-mobility 2DEG channels 电子-电子碰撞对高迁移率 2DEG 通道入口势降的影响
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022361
P. V. Pyshkin, A. V. Yanovsky
{"title":"Effect of electron-electron collisions on entrance potential drop in high-mobility 2DEG channels","authors":"P. V. Pyshkin, A. V. Yanovsky","doi":"10.1063/10.0022361","DOIUrl":"https://doi.org/10.1063/10.0022361","url":null,"abstract":"Usually, the evidence of viscous hydrodynamic transport of frequently colliding conduction electrons is considered to be the “Gurzhi effect,” which requires the scattering of electrons on the channel walls with momentum loss. However, we demonstrate that expansion of Sharvin’s potential drop directly related to frequent electron-electron collisions can be detected even in channels with ideally smooth walls in a two-dimensional degenerate electron gas (2DEG). In theory, this effect could be experimental evidence of the predicted earlier difference between the relaxation times of the antisymmetric and symmetric momentum distributions attributed to the Pauli principle and topological limitations in 2DEG.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138632873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nonlinear dynamics of magnetic multilayers. II. Antiferromagnetic interlayer interaction 磁性多层膜的非线性动力学。II.反铁磁层间相互作用
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022368
A. S. Kovalev, E. V. Ezerskaya, L. R. Krbashyan
{"title":"Nonlinear dynamics of magnetic multilayers. II. Antiferromagnetic interlayer interaction","authors":"A. S. Kovalev, E. V. Ezerskaya, L. R. Krbashyan","doi":"10.1063/10.0022368","DOIUrl":"https://doi.org/10.1063/10.0022368","url":null,"abstract":"An essentially nonlinear dynamics with a high level of excitation of a magnetic multilayer consisting of two nanolayers with a nonisotropic antiferromagnetic interaction between the layers is considered. The theoretical study was carried out within the framework of discrete Landau–Lifshitz equations without damping. Exact solutions of this integrable system are obtained for all types of nonlinear excitations. They are reduced to the nonlinear superposition of precessional and nutational oscillations of coupled macroscopic magnetic moments. The dependences of the oscillation frequencies of the moments on the total energy of the system and its magnetization along a preferred axis, which are integrals of motion, are found. In different ranges of values of these integrals, an exact, approximate, and qualitative study of the problem was carried out, which was accompanied by a direct numerical analysis of the initial equations. Attention is drawn to the possibility of significantly different levels of excitations of identical layers. Finding the relationship between the dynamic characteristics of excitations (their frequencies) and their integral characteristics (energy and magnetization) can be useful in studying multilayer systems by resonance methods.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"65 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138632564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vibration spectra of benzene-like models with Hooke’s law interactions 具有胡克定律相互作用的类苯模型的振动光谱
IF 0.8 4区 物理与天体物理
Low Temperature Physics Pub Date : 2023-12-13 DOI: 10.1063/10.0022370
M. M. Bogdan, O. V. Charkina, A. Y. Holovashchenko
{"title":"Vibration spectra of benzene-like models with Hooke’s law interactions","authors":"M. M. Bogdan, O. V. Charkina, A. Y. Holovashchenko","doi":"10.1063/10.0022370","DOIUrl":"https://doi.org/10.1063/10.0022370","url":null,"abstract":"The harmonic oscillations of a spring-ball model of benzene-like nanosystems with Hooke’s law interactions between nearest, second, and third neighbors are explored. We show that in the cylindrical coordinates the dynamics of this cyclic hexagonal system is described by the Lagrange equations similar to those of the one-dimensional two-component crystal model. We demonstrate that the vibration frequencies of the hexagonal model lie on the branches of the dispersion law of the associated lattice model, and their positions are determined by the cyclic Born-Von Karman condition. The hexagonal model is generalized to one describing the benzene molecule and the fully deuterated and halogenated benzenes. The effect of hybridization of vibration modes and pushing apart of spectral branches in the crossover situation is revealed. All the discrete frequency spectrum and normal modes of oscillations and their explicit dependencies on all the constants of elastic interactions are exactly found.","PeriodicalId":18077,"journal":{"name":"Low Temperature Physics","volume":"3 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138627832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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