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arXiv 1105.6039cond-mat.str-el
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量子猝灭后一维费米子的无规相位近似研究

A random phase approximation study of one-dimensional fermions after a quantum quench

Jarrett Lancaster, Thierry Giamarchi, Aditi Mitra

摘要:

采用随机相位近似(RPA)方法研究了相互作用对量子猝灭引起的非平衡稳态费米子系统的影响。作为淬灭的结果,费米子的分布函数被高度加宽。这就产生了一个增强的粒子-空穴谱和过阻尼集体模式的费米子之间的吸引力相互作用。另一方面,对于排斥相互作用,在粒子-空穴连续体之上的无阻尼模式存活。的非平衡稳态的性质上的结果的灵敏度进行了探讨,也考虑淬火,产生一个载流稳态。

英文摘要:

The effect of interactions on a system of fermions that are in a non-equilibrium steady state due to a quantum quench is studied employing the random-phase-approximation (RPA). As a result of the quench, the distribution function of the fermions is highly broadened. This gives rise to an enhanced particle-hole spectrum and over-damped collective modes for attractive interactions between fermions. On the other hand, for repulsive interactions, an undamped mode above the particle-hole continuum survives. The sensitivity of the result on the nature of the non-equilibrium steady state is explored by also considering a quench that produces a current carrying steady-state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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