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arXiv 0910.0255cond-mat.stat-mechcond-mat.quant-gas
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猝灭动力学作为量子临界性的探测器

Quench dynamics as a probe of quantum criticality

R. A. Barankov

摘要:

多体系统的量子临界点可以通过研究基态波函数对外部参数变化的响应来表征,这些参数编码在基态保真度磁化率中。该量表征了由参数的突然变化引起的失超动力学。在这个框架中,我分析的标度关系的概率激发和激发能,与淬火振幅这个参数。这些结果在一维sine-Gordon模型的情况下得到了说明。

英文摘要:

Quantum critical points of many-body systems can be characterized by studying response of the ground-state wave function to the change of the external parameter, encoded in the ground-state fidelity susceptibility. This quantity characterizes the quench dynamics induced by sudden change of the parameter. In this framework, I analyze scaling relations concerning the probability of excitation and the excitation energy, with the quench amplitude of this parameter. These results are illustrated in the case of one-dimensional sine-Gordon model.

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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