论文标题
在磁通量的Su-Schrieffer-Heeger模型中，非线性电流和动态量子相变
Non-linear current and dynamical quantum phase transitions in the flux-quenched Su-Schrieffer-Heeger model
论文作者
论文摘要
我们研究了一维环几何形状中Su-Schrieffer-Heeger模型中磁通量淬灭的动态效应。我们表明，即使系统最初处于半填充状态，磁通淬灭也会诱导最终达到有限固定值的时间依赖电流。这种持续的电流也存在于热力学极限中，无法通过线性响应理论捕获，并且是在二聚体存在下发生的非线性动力学效应的标志。此外，我们表明，对于二聚强度和初始通量的一系列值，尽管在模型的同一拓扑类别中执行了淬火，但该系统表现出动态量子相变。
We investigate the dynamical effects of a magnetic flux quench in the Su-Schrieffer-Heeger model in a one-dimensional ring geometry. We show that, even when the system is initially in the half-filled insulating state, the flux quench induces a time-dependent current that eventually reaches a finite stationary value. Such persistent current, which exists also in the thermodynamic limit, cannot be captured by the linear response theory and is the hallmark of nonlinear dynamical effects occurring in the presence of dimerization. Moreover, we show that, for a range of values of dimerization strength and initial flux, the system exhibits dynamical quantum phase transitions, despite the quench is performed within the same topological class of the model.
