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arXiv 1108.0928cond-mat.stat-mechcond-mat.quant-gasquant-ph
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本征态热化(Eigenstate Thermalization)

Alternatives to Eigenstate Thermalization

Marcos Rigol, Mark Srednicki

摘要:

一个初始纯态的孤立量子多体系统,如果满足本征态热化假设(ETH),将达到热平衡。我们考虑已经提出的ETH的替代品。我们首先证明了冯·诺依曼的量子遍历定理依赖于一个基本上等价于ETH的假设。我们还研究了是否,突然淬火后,特殊类的纯态可以导致系统的热行为,不服从ETH,即可积系统。我们找到了这样的例子,但仅限于在淬火之前服从ETH的初始状态。

英文摘要:

An isolated quantum many-body system in an initial pure state will come to thermal equilibrium if it satisfies the eigenstate thermalization hypothesis (ETH). We consider alternatives to ETH that have been proposed. We first show that von Neumann's quantum ergodic theorem relies on an assumption that is essentially equivalent to ETH. We also investigate whether, following a sudden quench, special classes of pure states can lead to thermal behavior in systems that do not obey ETH, namely, integrable systems. We find examples of this, but only for initial states that obeyed ETH before the quench.

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