Non-equilibrium quantum spin dynamics from classical stochastic processes

Non-equilibrium quantum spin dynamics from classical stochastic processes
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经典随机过程的非平衡量子自旋动力学

DOI:
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发表时间:
2019
期刊:
Journal of Statistical Mechanics: Theory and Experiment
影响因子:
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通讯作者:
M. Bhaseen
M. Bhaseen
中科院分区:
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文献类型:
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作者:
S. Nicola;B. Doyon;M. Bhaseen

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在我们最近工作的基础上,我们研究了非平衡量子自旋系统的随机方法。我们展示了如何该方法可以应用到各种物理观测值和不同的初始条件。我们提供了精确的公式,广泛适用的时间依赖性的期望值和相关函数的量子淬火后,在经典的随机过程的平均值。我们进一步探讨了经典随机变量在动态量子相变中的行为,包括它们的分布和相关函数的结果。我们提供了相关的随机微分方程的数值解的细节,并检查在经典的描述波动的增长。我们讨论了目前实施的随机方法和进一步发展的潜力的优势和局限性。
Following on from our recent work, we investigate a stochastic approach to non-equilibrium quantum spin systems. We show how the method can be applied to a variety of physical observables and for different initial conditions. We provide exact formulae of broad applicability for the time-dependence of expectation values and correlation functions following a quantum quench in terms of averages over classical stochastic processes. We further explore the behavior of the classical stochastic variables in the presence of dynamical quantum phase transitions, including results for their distributions and correlation functions. We provide details on the numerical solution of the associated stochastic differential equations, and examine the growth of fluctuations in the classical description. We discuss the strengths and limitations of the current implementation of the stochastic approach and the potential for further development.
DOI: 10.1126/science.1257026
发表时间: 2015-04-10
期刊: SCIENCE
影响因子: 56.9
作者:
Langen, Tim;Erne, Sebastian;Schmiedmayer, Joerg
通讯作者: Schmiedmayer, Joerg
DOI: 10.1103/physrevlett.110.257203
发表时间: 2013-06-18
影响因子: 8.6
作者:
Caux, Jean-Sebastien;Essler, Fabian H. L.
通讯作者: Essler, Fabian H. L.