声子驱动的Floquet物质
Phonon driven Floquet matter
摘要：
共振激发的相干声子导致晶体结构中原子晶格的周期性振荡，使材料进入非平衡电子构型。周期性振荡的量子系统可以理解的Floquet理论，我们表明这些概念可以应用到相干晶格振动反映电子和玻色子模式之间的耦合机制。这种耦合导致修饰的准粒子在电子结构的光谱中留下特定的印记。以石墨烯作为一种典型的材料，我们展示了如何声子修饰状态显示一个复杂的边带结构，揭示电子-声子耦合和拓扑有序。这项工作确立了最近证明的光致非平衡Floquet相位的概念，也可以应用时，使用相干声子模式的材料性能的动态控制。目前的结果是通用的玻色子含时微扰和类似的现象，可以观察到等离子体激元，磁振子或激子驱动的材料。
英文摘要：
A resonantly excited coherent phonon leads to a periodic oscillation of the atomic lattice in a crystal structure bringing the material into a non-equilibrium electronic configuration. Periodically oscillating quantum systems can be understood in terms of Floquet theory and we show these concepts can be applied to coherent lattice vibrations reflecting the underlying coupling mechanism between electrons and bosonic modes. This coupling leads to dressed quasi-particles imprinting specific signatures in the spectrum of the electronic structure. Taking graphene as a paradigmatic material we show how the phonon-dressed states display an intricate sideband structure revealing electron-phonon coupling and topological ordering. This work establishes that the recently demonstrated concept of light-induced non-equilibrium Floquet phases can also be applied when using coherent phonon modes for the dynamical control of material properties. The present results are generic for bosonic time-dependent perturbations and similar phenomena can be observed for plasmon, magnon or exciton driven materials.
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