论文标题
floquet拓扑阶段，$ p $ - 波不足的激发剂绝缘子
Floquet topological phase of nondriven $p$-wave nonequilibrium excitonic insulators
论文作者
论文摘要
{\ it p} - 波超流体的非平凡拓扑使这些系统在信息技术中具有吸引力。在这项工作中，我们报告了{\ it p}的拓扑状态 - 波无quilibrium激素绝缘子（NEQ-EI），并显示了如何通过合适的激光脉冲将其带向该状态的非肢体学带谱子，从而实现了动态的拓扑相过渡。过渡背后的基本机制是NEQ-EI的量规对称性损坏，这会导致激发液冷凝物的自我维持的持续振荡，从而以足够高的激子密度的浮雕拓扑状态。我们显示了在开放系统边界处的浮点major模式的形成，并讨论了ARPES实验的拓扑光谱特征。我们强调，{\ it p} -Wave neq-ei的拓扑特性仅来自电子孔库仑的相互作用，因为系统不受外部磁场的驱动。
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.
