Time-evolving Weiss fields in the stochastic approach to quantum spins

被引：2
|
作者：
Begg, S. E. [1 ]
Green, A. G. [2 ]
Bhaseen, M. J. [1 ]
机构：
[1] Kings Coll London, Dept Phys, London WC2R 2LS, England
[2] UCL, London Ctr Nanotechnol, Gordon St, London WC1H 0AH, England
来源：
PHYSICAL REVIEW B | 2021年 / 104卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
DYNAMICS;
D O I：
10.1103/PhysRevB.104.024408
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigate nonequilibrium quantum spin systems via an exact mapping to stochastic differential equations. This description is invariant under a shift in the mean of the Gaussian noise. We show that one can extend the simulation time for real-time dynamics in one and two dimensions by a judicious choice of this shift. This can be updated dynamically in order to reduce the impact of stochastic fluctuations. We discuss the connection to drift gauges in the gauge-P literature.
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页数：9
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