Journal of Statistical Mechanics: Theory and Experiment最新文献_第8页

Spectral statistics of driven Bose-Hubbard models 驱动型玻色-哈伯德模型的光谱统计

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-06-11 DOI: 10.1088/1742-5468/ad4e26

Jesús Mateos, Fernando Sols and Charles Creffield

引用次数: 0

Entanglement Hamiltonian in the non-Hermitian SSH model 非ermitian SSH 模型中的纠缠哈密顿

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-06-10 DOI: 10.1088/1742-5468/ad4860

Federico Rottoli, Michele Fossati, Pasquale Calabrese

引用次数: 0

Impact of dephasing probes on incommensurate lattices 去相位探针对不对称晶格的影响

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-06-10 DOI: 10.1088/1742-5468/ad4861

Bishal Ghosh, Sandipan Mohanta, Manas Kulkarni, Bijay Kumar Agarwalla

{"title":"Impact of dephasing probes on incommensurate lattices","authors":"Bishal Ghosh, Sandipan Mohanta, Manas Kulkarni, Bijay Kumar Agarwalla","doi":"10.1088/1742-5468/ad4861","DOIUrl":"https://doi.org/10.1088/1742-5468/ad4861","url":null,"abstract":"We investigate open quantum dynamics for a one-dimensional incommensurate Aubry–André–Harper lattice chain, a part of which is initially filled with electrons and is further connected to dephasing probes at the filled lattice sites. This setup is akin to a step-initial configuration where the non-zero part of the step is subjected to dephasing. We investigate the quantum dynamics of local electron density, the scaling of the density front as a function of time both inside and outside of the initial step, and the growth of the total number of electrons outside the step. We analyze these quantities in all three regimes, namely, the de-localized, critical, and localized phases of the underlying lattice. Outside the initial step, we observe that the density front spreads according to the underlying nature of single-particle states of the lattice, for both the de-localized and critical phases. For the localized phase, the spread of the density front hints at a logarithmic behavior in time that has no parallel in the isolated case (i.e. in the absence of probes). Inside the initial step, due to the presence of the probes, the density front spreads in a diffusive manner for all the phases. This combination of rich and different dynamical behavior, outside and inside the initial step, results in the emergence of mixed dynamical phases. While the total occupation of electrons remains conserved, the value outside or inside the initial step turns out to have a rich dynamical behavior. Our work is widely adaptable and has interesting consequences when disordered/quasi-disordered systems are subjected to a thermodynamically large number of probes.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"229 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141517223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Entangled multiplets, asymmetry, and quantum Mpemba effect in dissipative systems 耗散系统中的纠缠多子、不对称和量子姆彭巴效应

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-06-10 DOI: 10.1088/1742-5468/ad4537

Fabio Caceffo, Sara Murciano, Vincenzo Alba

{"title":"Entangled multiplets, asymmetry, and quantum Mpemba effect in dissipative systems","authors":"Fabio Caceffo, Sara Murciano, Vincenzo Alba","doi":"10.1088/1742-5468/ad4537","DOIUrl":"https://doi.org/10.1088/1742-5468/ad4537","url":null,"abstract":"Recently, the entanglement asymmetry emerged as an informative tool to understand dynamical symmetry restoration in out-of-equilibrium quantum many-body systems after a quantum quench. For integrable systems the asymmetry can be understood in the space-time scaling limit via the quasiparticle picture, as it was pointed out in Ares <italic toggle=\"yes\">et al</italic> (2023 <italic toggle=\"yes\">Nat. Commun.</italic>\u0000<bold>14</bold> 2036) . However, a quasiparticle picture for quantum quenches from generic initial states was still lacking. Here we conjecture a full-fledged quasiparticle picture for the charged moments of the reduced density matrix, which are the main ingredients to construct the asymmetry. Our formula works for quenches producing entangled multiplets of an arbitrary number of excitations. We benchmark our results in the <italic toggle=\"yes\">XX</italic> spin chain. First, by using an elementary approach based on the multidimensional stationary phase approximation we provide an <italic toggle=\"yes\">ab initio</italic> rigorous derivation of the dynamics of the charged moments for the quench treated in Ares <italic toggle=\"yes\">et al</italic> (2023 <italic toggle=\"yes\">SciPost Phys.</italic>\u0000<bold>15</bold> 089). Then, we show that the same results can be straightforwardly obtained within our quasiparticle picture. As a byproduct of our analysis, we obtain a general criterion ensuring a vanishing entanglement asymmetry at long times. Next, by using the Lindblad master equation, we study the effect of gain and loss dissipation on the entanglement asymmetry. Specifically, we investigate the fate of the so-called quantum Mpemba effect (QME) in the presence of dissipation. We show that dissipation can induce QME even if unitary dynamics does not show it, and we provide a quasiparticle-based interpretation of the condition for the QME.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"1 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Minimum connected dominating set and backbone of a random graph 随机图的最小连接支配集和骨干图

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-06-07 DOI: 10.1088/1742-5468/ad4026

Yusupjan Habibulla, Hai-Jun Zhou

引用次数: 0

Effect of global shrinkage parameter of horseshoe prior in compressed sensing 压缩传感中马蹄形先验全局收缩参数的影响

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-05-28 DOI: 10.1088/1742-5468/ad3195

Yasushi Nagano and Koji Hukushima

引用次数: 0

Pinning-depinning transitions in two classes of discrete elastic-string models in (2+1)-dimensions (2+1)维两类离散弹性弦模型中的针化-去针化转变

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-05-28 DOI: 10.1088/1742-5468/ad4af9

Yongxin Wu and Hui Xia

{"title":"Pinning-depinning transitions in two classes of discrete elastic-string models in (2+1)-dimensions","authors":"Yongxin Wu and Hui Xia","doi":"10.1088/1742-5468/ad4af9","DOIUrl":"https://doi.org/10.1088/1742-5468/ad4af9","url":null,"abstract":"The pinning-depinning phase transitions of interfaces for two classes of discrete elastic-string models are investigated numerically. In the (1+1)-dimensions, we revisit these two elastic-string models with slight modification to the growth rule, and compare the estimated values with the previous numerical and experimental results. For the (2+1)-dimensional case, we perform extensive simulations on pinning-depinning transitions in these discrete models with quenched disorder. For full comparisons in the physically relevant spatial dimensions, we also perform numerically two distinct universality classes, including the quenched Edwards–Wilkinson, and the quenched Kardar–Parisi–Zhang equations with and without external driving forces. The critical exponents of these systems in the presence of quenched disorder are numerically estimated. Our results show that the critical exponents satisfy scaling relations well, and these two discrete elastic-string models do not fall into the existing universality classes. In order to visually comparisons of these discrete systems with quenched disorder in the (2+1)-dimensional cases, we present surface morphologies with various external driving forces during the saturated time regimes. The relationships between surface morphologies, scaling exponents and correlation length are also revealed.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"5 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Weak (non)conservation and stochastic dynamics of angular momentum 角动量的弱（非）守恒和随机动力学

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-05-27 DOI: 10.1088/1742-5468/ad3cce

Ashot Matevosyan

{"title":"Weak (non)conservation and stochastic dynamics of angular momentum","authors":"Ashot Matevosyan","doi":"10.1088/1742-5468/ad3cce","DOIUrl":"https://doi.org/10.1088/1742-5468/ad3cce","url":null,"abstract":"Angular momentum conservation influences equilibrium statistical mechanics, leading to a generalized microcanonical density for an isolated system and a generalized Gibbs density for a weakly coupled system. We study the stochastic decay of angular momentum due to the weakly imperfect rotational symmetry of the external potential that confines the isolated many-particle system. We present a mesoscopic description of the system, deriving Langevin and Fokker–Planck equations, which are consistent with equilibrium statistical mechanics when rotational symmetry is maintained. When the symmetry is weakly violated, we formulate a coarse-grained stochastic differential equation governing the decay of total angular momentum over time. To validate our analytical predictions, we conduct numerical simulations of the microcanonical ensemble, an isolated system undergoing thermalization due to weak two-body interactions. Our coarse-grained Langevin equation accurately characterizes both the decay of the angular momentum and its fluctuations in a steady state. Furthermore, we estimate the parameters of our mesoscopic model directly from simulations, providing insights into the dissipative phenomenological coefficients, such as friction. More generally, this study contributes to a deeper understanding of the behavior of the integrals of motion when the corresponding symmetry is weakly violated.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"42 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141166270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 nonlinear disordered lattices: two kinds of scattering effects of hard-type and soft-type anharmonicities 一维非线性无序晶格中的导热性：硬型和软型非谐波的两种散射效应

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-05-27 DOI: 10.1088/1742-5468/ad4025

Jianjin Wang, Chi Xiong and Daxing Xiong

{"title":"Thermal conductivity in one-dimensional nonlinear disordered lattices: two kinds of scattering effects of hard-type and soft-type anharmonicities","authors":"Jianjin Wang, Chi Xiong and Daxing Xiong","doi":"10.1088/1742-5468/ad4025","DOIUrl":"https://doi.org/10.1088/1742-5468/ad4025","url":null,"abstract":"Amorphous solids can be theoretically modeled by anharmonic disordered lattices, but most of the theoretical studies on thermal conductivity in such lattices only consider hard-type (HT) anharmonicity. In this study, we investigate the thermal conductivity κ of one-dimensional disordered lattices with both HT and soft-type (ST) anharmonic on-site potentials. Our results from molecular dynamics simulations and the quasi-harmonic Green–Kubo (QHGK) method show that while the HT model exhibits non-monotonic dependence of κ on anharmonicity, the ST model shows a monotonically increasing trend. This trend provides a novel approach to enhancing thermal conductivity in disordered systems. Additionally, the QHGK predictions for κ in the HT model are consistent with simulation results over a wide range of anharmonicity values; however, for the ST model, deviations appear as the anharmonicity becomes softer. This peculiar feature may be attributed to delocalization effects being dominant in contrast to the competing roles played by both delocalization and localization effects observed in the HT model.","PeriodicalId":17207,"journal":{"name":"Journal of Statistical Mechanics: Theory and Experiment","volume":"62 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141166265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Constant speed random particles spontaneously confined on the surface of an expanding sphere 自发限制在膨胀球体表面的恒速随机粒子

IF 2.4 3区物理与天体物理

Journal of Statistical Mechanics: Theory and Experiment Pub Date : 2024-05-27 DOI: 10.1088/1742-5468/ad4023

Maurizio Serva

引用次数: 0