论文标题

随机重置在振荡场驱动的紧密结合链的背景下

Stochastic resets in the context of a tight-binding chain driven by an oscillating field

论文作者

Dattagupta, Sushanta, Das, Debraj, Gupta, Shamik

论文摘要

在这项工作中,我们在所谓的驱动紧密结合链(TBC)的框架中研究量子统一动力学的问题随机散布,随机散布随机重置,模仿了由于与外部环境的相互作用而导致的非独立进化,而驱动的TBC涉及一个量子粒子在外部近端的位置之间的量子范围内的量子构成了一个时期的构图,并在某个时期内部构成了一个时代的时代和时代的时代。我们认为重置是在指数分配的随机时间进行。使用随机liouville方程的方法,我们在给定时间得出概率的精确结果,以便在不同的位点找到粒子,并相对于动力学的不同实现。我们长期以来建立了TBC粒子对基础晶格的位点的显着影响。在不存在随机重置的情况下,该系统表现出粒子的离域化,即使在长时间内,粒子也没有在不同位点发现的时间独立的概率分布,因此,粒子围绕其初始位置的均值位移的时间是无界生长的。一个人只能通过调整强度与磁场频率的比率以具有特殊值的比率,即,即等于第一类零订单贝塞尔函数的零零之一。我们在这里表明,可以通过将系统进行随机重置的更简单的过程引起的定位。

In this work, we study in the framework of the so-called driven tight-binding chain (TBC) the issue of quantum unitary dynamics interspersed at random times with stochastic resets mimicking non-unitary evolution due to interactions with the external environment, The driven TBC involves a quantum particle hopping between the nearest-neighbour sites of a one-dimensional lattice and subject to an external forcing field that is periodic in time. We consider the resets to be taking place at exponentially-distributed random times. Using the method of stochastic Liouville equation, we derive exact results for the probability at a given time for the particle to be found on different sites and averaged with respect to different realizations of the dynamics. We establish the remarkable effect of localization of the TBC particle on the sites of the underlying lattice at long times. The system in the absence of stochastic resets exhibits delocalization of the particle, whereby the particle does not have a time-independent probability distribution of being found on different sites even at long times, and, consequently, the mean-squared displacement of the particle about its initial location has an unbounded growth in time. One may induce localization in the bare model only through tuning the ratio of the strength to the frequency of the field to have a special value, namely, equal to one of the zeros of the zeroth order Bessel function of the first kind. We show here that localization may be induced by a far simpler procedure of subjecting the system to stochastic resets.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源