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arXiv 1003.1403cond-mat.stat-mechcond-mat.quant-gas
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带隙系统中的量子混沌与热化

Quantum chaos and thermalization in gapped systems

Marcos Rigol, Lea F. Santos

摘要:

我们研究了有限一维带隙硬核玻色子系统中热化和量子混沌的发生。这些系统中的可积性被次近邻排斥相互作用打破,这也产生了超流到绝缘体的转变。利用完全精确对角化方法,研究了混沌指标和少体观测量。我们发现,随着系统尺寸的增加,混沌行为被认为是在更广泛的参数范围内,特别是更深的绝缘相。同时,我们观察到,随着系统尺寸的增加,本征态热化假设的有效性范围内的绝缘相,并伴随着系统的热化。

英文摘要:

We investigate the onset of thermalization and quantum chaos in finite one-dimensional gapped systems of hard-core bosons. Integrability in these systems is broken by next-nearest-neighbor repulsive interactions, which also generate a superfluid to insulator transition. By employing full exact diagonalization, we study chaos indicators and few-body observables. We show that with increasing system size, chaotic behavior is seen over a broader range of parameters and, in particular, deeper into the insulating phase. Concomitantly, we observe that, as the system size increases, the eigenstate thermalization hypothesis extends its range of validity inside the insulating phase and is accompanied by the thermalization of the system.

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