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arXiv 1804.04069cond-mat.str-elcond-mat.stat-mechquant-ph
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量子猝灭后$t$ - $J$链对关联函数中视界效应的抑制

Suppression of the horizon effect in pairing correlation functions of $t$-$J$ chains after a quantum quench

A. D. Kühn, L. Cevolani, S. R. Manmana

摘要:

利用含时密度矩阵重整化群(tDMRG)研究了一维$t$ - $J$模型中密度、自旋和配对关联函数随时间的演化.虽然密度和自旋关联函数在很宽的参数范围内表现出典型的光锥行为,但在配对关联函数中,它被强烈抑制。这是支持的时间依赖BCS理论,在配对关联函数中的光锥被发现是至少两个数量级弱于密度相关器。这些发现表明,在全球量子猝灭,并不是所有的观测量受到同样的激发。

英文摘要:

We investigate the time evolution of density, spin, and pairing correlation functions in one-dimensional $t$-$J$ models following a quantum quench using the time-dependent density matrix renormalization group (tDMRG). While density and spin correlation functions show the typical light-cone behavior over a wide range of parameters, in pairing correlation functions it is strongly suppressed. This is supported by time-dependent BCS theory, where the light-cone in the pairing correlation functions is found to be at least two orders of magnitude weaker than in the density correlator. These findings indicate that in global quantum quenches not all observables are affected by the excitations equally.

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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