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arXiv 1406.6500cond-mat.str-elcond-mat.quant-gasnucl-thphysics.atom-ph
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量子猝灭后的普适短时响应和关联的形成

Universal short-time response and formation of correlations after quantum quenches

K. Morawetz

摘要:

半导体的泵浦和探测实验以及光晶格中冷原子的突然猝灭两个不同系统的短时演化可以用相同的普适响应函数来描述。这个短时间尺度下的解析公式是从量子动力学理论方法中推导出来的,该方法观察到相关性需要时间才能形成。密度守恒的要求导致弛豫时间减少了四分之一,在淬火设置。导出并讨论了有限捕获势的影响以及Singwi-Sjølander局域场修正。

英文摘要:

The short-time evolution of two distinct systems, the pump and probe experiments with semiconductor and the sudden quench of cold atoms in an optical lattice, is found to be described by the same universal response function. This analytic formula at short time scales is derived from the quantum kinetic theory approach observing that correlations need time to be formed. The demand of density conservation leads to a reduction of the relaxation time by a factor of four in quench setups. The influence of finite trapping potential is derived and discussed as well as Singwi-Sjølander local field corrections.

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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