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arXiv 1609.09258cond-mat.stat-mechquant-ph
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经典遍历性和量子本征态热化:全连通Ising铁磁体的分析

Classical ergodicity and quantum eigenstate thermalization: Analysis in fully connected Ising ferromagnets

Takashi Mori

摘要:

研究了全连通伊辛铁磁体的经典遍历性与量子本征态热化之间的关系。在自旋为1/2的情况下,单个能量本征态中的可观测值的期望值与基础经典动力学中的长时间平均值相一致,这是Wentzel-Kramers-Brillouin近似的结果。在自旋为1的情况下,潜在的经典动力学不一定是遍历的。在这种情况下,事实证明,在热力学极限下,能量本征态中的可观测值的期望值的统计与从经典相空间均匀采样的随机初始状态开始的基础经典动力学中的长时间平均值的统计相一致。这一特征似乎是半经典系统的普遍性质,本文给出的结果对于讨论这类系统的平衡、热化和动力学跃迁是至关重要的。

英文摘要:

We investigate the relation between the classical ergodicity and the quantum eigenstate thermalization in the fully connected Ising ferromagnets. In the case of spin-1/2, an expectation value of an observable in a single energy eigenstate coincides with the long-time average in the underlying classical dynamics, which is a consequence of the Wentzel-Kramers-Brillouin approximation. In the case of spin-1, the underlying classical dynamics is not necessarily ergodic. In that case, it turns out that, in the thermodynamic limit, the statistics of the expectation values of an observable in the energy eigenstates coincides with the statistics of the long-time averages in the underlying classical dynamics starting from random initial states sampled uniformly from the classical phase space. This feature seems to be a general property in semiclassical systems, and the result presented here is crucial in discussing equilibration, thermalization, and dynamical transitions of such systems.

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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