论文标题
用量子光控制物质的拓扑阶段
Controlling topological phases of matter with quantum light
论文作者
论文摘要
控制量子物质的拓扑特性是凝结物理物理学的主要目标。在这个方向上的主要努力已致力于以浮雕驱动器的形式使用经典光来操纵和诱导具有非平凡拓扑的状态。可以使用空腔光子来实现不同的路线。在这里，我们考虑了拓扑相变的典型模型，即一维Su-Schrieffer-Heeger（SSH）模型，该模型耦合到单个模式腔。我们表明，量子光可以影响系统的拓扑特性，包括有限长度的能量光谱托管边缘模式和拓扑相图。特别是，我们表明，取决于晶格几何形状和光耦合的强度，可以使用量子腔场将微不足道的相变成拓扑相，或者使用量化相。此外，我们计算了耦合电子 - 光子系统的极性光谱，并注意到下极化子分支在拓扑过渡点消失。该现象可用于探测SSH模型中的相变。
Controlling the topological properties of quantum matter is a major goal of condensed matter physics. A major effort in this direction has been devoted to using classical light in the form of Floquet drives to manipulate and induce states with non-trivial topology. A different route can be achieved with cavity photons. Here we consider a prototypical model for topological phase transition, the one-dimensional Su-Schrieffer-Heeger (SSH) model, coupled to a single mode cavity. We show that quantum light can affect the topological properties of the system, including the finite-length energy spectrum hosting edge modes and the topological phase diagram. In particular we show that depending on the lattice geometry and the strength of light-matter coupling one can either turn a trivial phase into a topological one or viceversa using quantum cavity fields. Furthermore, we compute the polariton spectrum of the coupled electron-photon system, and we note that the lower polariton branch disappears at the topological transition point. This phenomenon can be used to probe the phase transition in the SSH model.
