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arXiv 0907.3766quant-phcond-mat.stat-mechnlin.CD
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量子相变下生存概率的半经典方法

Semiclassical Approach to Survival Probability at Quantum Phase Transitions

Wen-ge Wang, Pinquan Qin, Lewei He, Ping Wang

摘要:

本文研究了量子相变(QPT)时生存概率的衰减。发现半经典理论适用于具有无穷简并度的临界点附近。该理论预测在d=1的系统中生存概率相对较长时间的幂律衰减和在d足够大的系统中的指数衰减,其中d是基本经典动力学的自由度。在四个模型的半经典预测进行了数值检验。

英文摘要:

We study the decay of survival probability at quantum phase transitions (QPT). The semiclassical theory is found applicable in the vicinities of critical points with infinite degeneracy. The theory predicts a power law decay of the survival probability for relatively long times in systems with d=1 and an exponential decay in systems with sufficiently large d, where d is the degrees of freedom of the underlying classical dynamics. The semiclassical predictions are checked numerically in four models.

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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