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arXiv 1903.09652cond-mat.str-elhep-th
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非费米液体到费米液体相变的猝灭、热化和剩余熵

Quench, thermalization and residual entropy across a non-Fermi liquid to Fermi liquid transition

Arijit Haldar, Prosenjit Haldar, Surajit Bera, Ipsita Mandal, Sumilan Banerjee

摘要:

本文研究了一个具有从Sachdev-Ye-Kitaev(SYK)非费米液体(NFL)到费米液体(FL)的量子相变的相互作用模型在突然和缓慢猝灭后的热化。该模型具有耦合到非相互作用的铅费米子的SYK费米子,并且可以在连接到外部引线的石墨烯薄片中实现。在突然淬灭到NFL之后,通过铅费米子的准粒子残余物的振荡复兴振荡迅速达到热态。相反,淬火到FL,跨越NFL-FL过渡,导致多个预热制度和更慢的热化。在缓慢淬火进行了一段时间$τ$,我们发现,产生的激发能有一个显着的中间- $τ$非解析幂律依赖,$τ^{-η}$与$η<1$,这似乎掩盖了SYK费米子的初始剩余熵的动力学表现。由于SYK费米子中存在的剩余熵,幂律标度预计最终会打破$τ\to\infty$,表明绝热性的破坏。

英文摘要:

We study the thermalization, after sudden and slow quenches, of an interacting model having a quantum phase transition from a Sachdev-Ye-Kitaev (SYK) non-Fermi liquid (NFL) to a Fermi liquid (FL). The model has SYK fermions coupled to non-interacting lead fermions and can be realized in a graphene flake connected to external leads. After a sudden quench to the NFL, a thermal state is reached rapidly via collapse-revival oscillations of the quasiparticle residue of the lead fermions. In contrast, the quench to the FL, across the NFL-FL transition, leads to multiple prethermal regimes and much slower thermalization. In the slow quench performed over a time $τ$, we find that the excitation energy generated has a remarkable intermediate-$τ$ non-analytic power-law dependence, $τ^{-η}$ with $η<1$, which seemingly masks the dynamical manifestation of the initial residual entropy of the SYK fermions. The power-law scaling is expected to eventually break down for $τ\to\infty$, signaling a violation of adiabaticity, due to the residual entropy present in the SYK fermions.

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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