论文标题
预测的有机盐中的照片引起的拓扑阶段$α$ - （bedt-ttf）$ _ 2 $ i $ _3 $
Predicted Photo-Induced Topological Phases in Organic Salt $α$-(BEDT-TTF)$_2$I$_3$
论文作者
论文摘要
从理论上讲，光引起的拓扑阶段及其相变的出现在有机盐$α$ - （bedt-ttf）$ _ 2 $ i $ _3 $中预测，该$ _ 2 $ i $ _3 $，在其带结构中具有倾斜的迪拉克锥。通过分析使用Floquet定理描述BedT-TTF层中的传导电子的光驱动的紧密结合模型，我们证明，圆形极化光的照射在DIRAC点上开出一个间隙，并且该系统最终成为Chern绝缘子，其特征在于以量化的拓扑为拓扑作用。在光的平面和光频率的平面上获得了丰富的相图，其中包含Chern绝缘子，半准和正常绝缘体阶段。我们发现，光诱导的霍尔电导率提供了一种敏感手段，可以通过实验检测预测的相位演变。这项工作有助于通过扩大表现出光诱导拓扑相变的目标材料的范围来开发物质对物质的光学操纵。
The emergence of photo-induced topological phases and their phase transitions are theoretically predicted in organic salt $α$-(BEDT-TTF)$_2$I$_3$, which possesses inclined Dirac cones in its band structure. By analyzing a photo-driven tight-binding model describing conduction electrons in the BEDT-TTF layer using the Floquet theorem, we demonstrate that irradiation with circularly polarized light opens a gap at the Dirac points, and the system eventually becomes a Chern insulator characterized by a quantized topological invariant. A rich phase diagram is obtained in plane of amplitude and frequency of light, which contains Chern insulator, semimetal, and normal insulator phases. We find that the photo-induced Hall conductivity provides a sensitive means to detect the predicted phase evolutions experimentally. This work contributes towards developing the optical manipulation of electronic states in matter through broadening the range of target materials that manifest photo-induced topological phase transitions.
