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arXiv 1606.02576cond-mat.str-elcond-mat.quant-gas
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Luttinger液体中有限时间量子猝灭期间和之后的时间演化

Time evolution during and after finite-time quantum quenches in Luttinger liquids

Piotr Chudzinski, Dirk Schuricht

摘要:

我们考虑有限时间量子猝灭的相互作用Tomonaga-Luttinger模型,例如时间相关的变化的最近邻相互作用的无自旋费米子。我们使用特定协议的精确解,包括线性和余弦斜坡(或更一般地,周期性泵浦)。我们研究的动力学的总能量和动能,以及格林函数期间以及淬火后。对于后者,我们发现,光锥图片仍然适用,但是,传播前延迟相比,突然淬火。我们提取的通用行为的格林函数,特别是提供分析,非微扰的结果适用于淬火的短到中等的持续时间,但任意的时间依赖性的延迟。

英文摘要:

We consider finite-time quantum quenches in the interacting Tomonaga--Luttinger model, for example time-dependent changes of the nearest-neighbour interactions for spinless fermions. We use the exact solutions for specific protocols including the linear and cosine ramps (or, more generally, periodic pumping). We study the dynamics of the total and kinetic energy as well as the Green functions during as well as after the quench. For the latter we find that the light-cone picture remains applicable, however, the propagating front is delayed as compared to the sudden quench. We extract the universal behaviour of the Green functions and in particular provide analytic, non-perturbative results for the delay applicable to quenches of short to moderate duration but arbitrary time dependency.

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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