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arXiv 2007.12113cond-mat.stat-mechcond-mat.quant-gasquant-ph
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在流体动力学极限中大偏差的动力学:非相互作用系统

Dynamics of large deviations in the hydrodynamic limit: Non-interacting systems

Gabriele Perfetto, Andrea Gambassi

摘要:

我们研究了在两个不同温度下热化的两个相同的半无限部分的非均匀初始状态下,量子链上一点上能量转移的统计动力学。特别是,我们认为横向场伊辛和谐波链的非相互作用的费米和玻色子激发的原型模型,分别。在大时空尺度的流体力学极限下,我们首先讨论了能量密度和流的平均值,然后针对涨落的统计性,精确计算了转移能量的标度累积母函数。从后者出发,得到了相应的大偏差函数的演化。一个自然的解释,我们的结果提供了一个半经典的准粒子沿经典轨迹弹道运动的图片。讨论了非相互作用费米子和玻色子情况下转移能量标度累积量与大偏差函数的异同。

英文摘要:

We study the dynamics of the statistics of the energy transferred across a point along a quantum chain which is prepared in the inhomogeneous initial state obtained by joining two identical semi-infinite parts thermalized at two different temperatures. In particular, we consider the transverse field Ising and harmonic chains as prototypical models of non-interacting fermionic and bosonic excitations, respectively. Within the so-called hydrodynamic limit of large space-time scales we first discuss the mean values of the energy density and current, and then, aiming at the statistics of fluctuations, we calculate exactly the scaled cumulant generating function of the transferred energy. From the latter, the evolution of the associated large deviation function is obtained. A natural interpretation of our results is provided in terms of a semi-classical picture of quasi-particles moving ballistically along classical trajectories. Similarities and differences between the transferred energy scaled cumulant and the large deviation functions in the cases of non-interacting fermions and bosons are discussed.

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