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arXiv 1508.07971cond-mat.stat-mechquant-ph
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载流非平衡态在淬火过程中的缺陷产生

Defect production in quench from current-carrying non-equilibrium state

Dragi Karevski, Rosemary J. Harris

摘要:

我们考虑了一个量子系统的缺陷产生,该系统初始处于载流非平衡态,在幺正驱动过程中通过量子临界点。在初始电流的低值,量子Kibble-Zurek缩放的缺陷的生产被恢复。然而,在初始电流的大值处,即,在远离初始平衡状态的情况下,获得了缺陷产生的普遍标度,其显示出相对于初始电流值的代数依赖性。这些缩放预测证明了完全可解的伊辛量子链,其中载流状态是通过施加的Dzyaloshinskiii-Moriya相互作用项选择。

英文摘要:

We consider the defect production of a quantum system, initially prepared in a current-carrying non-equilibrium state, during its unitary driving through a quantum critical point. At low values of the initial current, the quantum Kibble-Zurek scaling for the production of defects is recovered. However, at large values of the initial current, i.e., very far from an initial equilibrium situation, a universal scaling of the defect production is obtained which shows an algebraic dependence with respect to the initial current value. These scaling predictions are demonstrated by the exactly solvable Ising quantum chain where the current-carrying state is selected through the imposition of a Dzyaloshinskii-Moriya interaction term.

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