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arXiv 0903.4568quant-phmath-phmath.MPnlin.CD
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伪Hermitian Dicke模型的能级统计

Level statistics of a pseudo-Hermitian Dicke model

Tetsuo Deguchi, Pijush K. Ghosh, Kazue Kudo

摘要:

一个非厄米特算子通过相似变换与它的伴随算子相联系,被定义为伪厄米特算子。本文研究了一个经历量子相变(QPT)的伪厄米Dicke哈密顿量的能级统计。我们发现,在可积极限附近,该哈密顿量的能级间距分布接近泊松分布,而在不可积的参数范围内,该哈密顿量的能级间距分布为维格纳分布。我们表明,在标准的迪克模型的上下文中,QPT是一个前兆的水平统计变化的断言是无效的。

英文摘要:

A non-Hermitian operator that is related to its adjoint through a similarity transformation is defined as a pseudo-Hermitian operator. We study the level-statistics of a pseudo-Hermitian Dicke Hamiltonian that undergoes Quantum Phase Transition (QPT). We find that the level-spacing distribution of this Hamiltonian near the integrable limit is close to Poisson distribution, while it is Wigner distribution for the ranges of the parameters for which the Hamiltonian is non-integrable. We show that the assertion in the context of the standard Dicke model that QPT is a precursor to a change in the level statistics is not valid in general.

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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