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arXiv 1606.08459cond-mat.stat-mechcond-mat.mes-hall
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量子可积动力学的高斯系综

Gaussian ensemble for quantum integrable dynamics

Hyungwon Kim, Anatoli Polkovnikov, Emil A. Yuzbashyan

摘要:

我们提出一个高斯系综作为孤立量子可积系统的长时间动力学的描述。我们的方法扩展了广义吉布斯熵(GGE)纳入波动的运动积分。它是渐近精确的经典极限,无论系统的大小,并在适当的条件下,在热力学极限,无论普朗克常数的值。此外,它捕获的经典极限附近的量子校正,有限尺寸的热力学极限附近的校正,并在非局域相互作用的存在下是有效的。高斯系综弥补了经典可积系统和广义系统之间的差距。我们用越来越复杂的例子来说明我们的结果。

英文摘要:

We propose a Gaussian ensemble as a description of the long-time dynamics of isolated quantum integrable systems. Our approach extends the Generalized Gibbs Ensemble (GGE) by incorporating fluctuations of integrals of motion. It is asymptotically exact in the classical limit irrespective of the system size and, under appropriate conditions, in the thermodynamic limit irrespective of the value of Planck's constant. Moreover, it captures quantum corrections near the classical limit, finite size corrections near the thermodynamic limit, and is valid in the presence of non-local interactions. The Gaussian ensemble bridges the gap between classical integrable systems, where a generalized microcanonical ensemble is exact even for few degrees of freedom and GGE, which requires thermodynamic limit. We illustrate our results with examples of increasing complexity.

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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