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arXiv 0812.0561cond-mat.str-el
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量子猝灭后强相互作用费米子关联的时间演化

Time evolution of correlations in strongly interacting fermions after a quantum quench

Salvatore R. Manmana, Stefan Wessel, Reinhard M. Noack, Alejandro Muramatsu

摘要:

利用自适应含时密度矩阵重整化群,研究了一维晶格上相互作用无自旋费米子的密度关联在相互作用强度突变后的时间演化.在很宽的模型参数范围内,关联函数表现出一个典型的光锥状的时间演化代表的弹道输运的信息。当将绝缘体淬火到金属区域中时以及当在绝缘区域内淬火时都观察到这种行为。然而,当超过量子临界点的金属态被淬灭到绝缘状态时,没有观察到弹道输运的迹象。相反,稳定的域壁的密度相关性出现在时间演化过程中,与Kibble-Zurek机制的预测一致。

英文摘要:

Using the adaptive time-dependent density matrix renormalization group, we study the time evolution of density correlations of interacting spinless fermions on a one-dimensional lattice after a sudden change in the interaction strength. Over a broad range of model parameters, the correlation function exhibits a characteristic light-cone-like time evolution representative of a ballistic transport of information. Such behavior is observed both when quenching an insulator into the metallic region and also when quenching within the insulating region. However, when a metallic state beyond the quantum critical point is quenched deep into the insulating regime, no indication for ballistic transport is observed. Instead, stable domain walls in the density correlations emerge during the time evolution, consistent with the predictions of the Kibble-Zurek mechanism.

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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