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

机译:量子猝灭后强相互作用费米子中相关性的时间演化

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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.
机译:使用自适应时变密度矩阵重新归一化组,我们研究了相互作用强度突然变化后,一维晶格上相互作用的无旋费米子的密度相关性的时间演化。在广泛的模型参数范围内,相关函数展现出特征性的类似于光锥的时间演化,表示信息的弹道传输。在将绝缘体淬火到金属区域中以及在绝缘区域内淬火时都观察到这种行为。但是,当超过量子临界点的金属态淬灭到绝缘状态深处时,没有观察到弹道运输的迹象。取而代之的是,在时间演化过程中出现了密度相关性的稳定畴壁,这与Kibble-Zurek机制的预测一致。

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