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arXiv 2004.14376hep-thcond-mat.stat-mech
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荷电SYK模型不同阶段的热化

Thermalization in different phases of charged SYK model

Tousik Samui, Nilakash Sorokhaibam

摘要:

研究了带电SYK模型在两个不同阶段的热化。我们表明,高度混乱的液相和稀气相热化。令人惊讶的是,稀气体状态瞬间热化。我们认为,这种现象的出现,因为在这个阶段的系统只包括长寿命的准粒子在非常低的密度。液态的热化速度是指数级的。我们还表明,额外引入的随机质量变形(q=2 SYK项)减慢热化,但系统热化指数快速。这是观察到的,尽管事实上,增加大q=2 SYK相互作用的力量谱统计服从泊松统计。一个有趣的新观察是,液态热化过程中的有效温度是非单调的。在稳定到最终值之前,它会在相对较长的时间内发生颠簸。在非零化学势的情况下,有效温度在稳定到最终值之前会有明显的振荡。

英文摘要:

We study thermalization of charged SYK model in two different phases. We show that both the highly chaotic liquid phase and the dilute gas phase thermalize. Surprisingly the dilute gas state thermalizes instantaneously. We argue that this phenomenon arises because the system in this phase consists of only long-lived quasi-particles at very low density. The liquid state thermalizes exponentially fast. We also show that the additional introduction of random mass deformation (q=2 SYK term) slows down thermalization but the system thermalizes exponentially fast. This is observed despite the fact that the addition of large q=2 SYK interaction forces spectral statistics to obey Poisson statistics. An interesting new observation is that the effective temperature is non-monotonic during thermalization in the liquid state. It has a bump at relatively long time before settling down to the final value. With non-zero chemical potential, the effective temperature oscillates noticeably before settling down to the final value.

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