论文标题

开放式耗散多体系统跨越量子过渡

Dynamic Kibble-Zurek scaling framework for open dissipative many-body systems crossing quantum transitions

论文作者

Rossini, Davide, Vicari, Ettore

论文摘要

我们研究了由于与环境的相互作用而存在耗散的量子动力学,在Kibble-Zurek(KZ)方案下,其中一个汉密尔顿参数缓慢而线性地延伸,跨越了零温度量子过渡的临界值。特别是我们解决开放量子系统以及在哪些条件下是否可以开发出类似于封闭系统中出现的通用动态缩放制度。我们专注于一类耗散机制,这些机制可以通过控制系统密度矩阵的时间演变来可靠地描述它们的动力学。我们认为,即使在存在耗散的情况下,动态缩放极限也存在,其主要特征受量子过渡的通用类别控制。 This requires a particular tuning of the dissipative interactions, whose decay rate $u$ should scale as $u\sim t_s^{-κ}$ with increasing the time scale $t_s$ of the KZ protocol, where the exponent $κ= z/(y_μ+z)$ depends on the dynamic exponent $z$ and the renormalization-group dimension $y_μ$ of the driving Hamiltonian parameter.我们的动态缩放参数得到了用于在量子链链的相同普遍性类别中经过量子过渡的一维费米电线的数值结果的支持,在存在包括局部泵送,衰减,衰减和驱动的量子机制的情况下。

We study the quantum dynamics of many-body systems, in the presence of dissipation due to the interaction with the environment, under Kibble-Zurek (KZ) protocols in which one Hamiltonian parameter is slowly, and linearly in time, driven across the critical value of a zero-temperature quantum transition. In particular we address whether, and under which conditions, open quantum systems can develop a universal dynamic scaling regime similar to that emerging in closed systems. We focus on a class of dissipative mechanisms whose dynamics can be reliably described through a Lindblad master equation governing the time evolution of the system's density matrix. We argue that a dynamic scaling limit exists even in the presence of dissipation, whose main features are controlled by the universality class of the quantum transition. This requires a particular tuning of the dissipative interactions, whose decay rate $u$ should scale as $u\sim t_s^{-κ}$ with increasing the time scale $t_s$ of the KZ protocol, where the exponent $κ= z/(y_μ+z)$ depends on the dynamic exponent $z$ and the renormalization-group dimension $y_μ$ of the driving Hamiltonian parameter. Our dynamic scaling arguments are supported by numerical results for KZ protocols applied to a one-dimensional fermionic wire undergoing a quantum transition in the same universality class of the quantum Ising chain, in the presence of dissipative mechanisms which include local pumping, decay, and dephasing.

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