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arXiv 0911.1302cond-mat.quant-gascond-mat.stat-mech
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量子sine-Gordon模型中相互作用的突然猝灭

Sudden interaction quench in the quantum sine-Gordon model

J. Sabio, S. Kehrein

摘要:

研究了量子sine-Gordon模型弱耦合区中的突然相互作用猝灭。用流动方程法计算了玻色模占据数的实时动态。虽然我们不能证明结果的渐近长的时间限制,我们可以建立一个扩展的制度在时间上的模式占领数放松到两倍的平衡值。这个因子2表示非平衡分布,并且是弱相互作用猝灭的普遍特征。因此,弱耦合量子sine-Gordon模型处于热化和非热化之间的边界。

英文摘要:

We study a sudden interaction quench in the weak-coupling regime of the quantum sine-Gordon model. The real time dynamics of the bosonic mode occupation numbers is calculated using the flow equation method. While we cannot prove results for the asymptotic long time limit, we can establish the existence of an extended regime in time where the mode occupation numbers relax to twice their equilibrium values. This factor two indicates a non-equilibrium distribution and is a universal feature of weak interaction quenches. The weak-coupling quantum sine-Gordon model therefore turns out to be on the borderline between thermalization and non-thermalization.

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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