非驱动$p$波非平衡激子绝缘体的Floquet拓扑相
Floquet topological phase of nondriven $p$-wave nonequilibrium excitonic insulators
摘要：
{ \it p}波超流体的非平凡拓扑结构使其成为信息技术领域的重要研究对象。在这项工作中，我们报告的拓扑状态的{ \it p}波非平衡激子绝缘体（NEQ-EI），并显示如何引导一个非拓扑带绝缘体与明亮的$p$激子向这个状态，通过适当的激光脉冲，从而实现动态拓扑相变。转变背后的基本机制是NEQ-EI的规范对称性破缺，这会导致激子凝聚体的自持持续振荡，因此对于足够高的激子密度，会出现Floquet拓扑状态。我们显示的Floquet Majorana模式的形成在开放系统的边界，并讨论了ARPES实验的拓扑光谱签名。我们强调，拓扑性质的{ \it p}波NEQ-EI产生完全从电子-空穴库仑相互作用的系统是不受外部场驱动。
英文摘要：
The nontrivial topology of {\it p}-wave superfluids make these systems attractive candidate in information technology. In this work we report on the topological state of a {\it p}-wave nonequilibrium excitonic insulator (NEQ-EI) and show how to steer a nontopological band-insulator with bright $p$-excitons toward this state by a suitable laser pulse, thus achieving a dynamical topological phase transition. The underlying mechanism behind the transition is the broken gauge-symmetry of the NEQ-EI which causes self-sustained persistent oscillations of the excitonic condensate and hence a Floquet topological state for high enough exciton densities. We show the formation of Floquet Majorana modes at the boundaries of the open system and discuss topological spectral signatures for ARPES experiments. We emphasize that the topological properties of a {\it p}-wave NEQ-EI arise exclusively from the electron-hole Coulomb interaction as the system is not driven by external fields.
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