School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu611731, China.
ACS Appl Mater Interfaces. 2023 Jan 25;15(3):4764-4773. doi: 10.1021/acsami.2c19115. Epub 2023 Jan 11.
Efficiently and flexibly manipulating unidirectional edge states is key to developing topological insulators as functional devices. In this work, we propose an all-optical method that utilizes the valley-selective optical Stark effect to realize programmable topological insulators. We pattern a two-dimensional honeycomb structure in an exciton-polariton platform resulting from a strong light-matter coupling in a monolayer transition metal dichalcogenide. The optical Stark effect is induced to generate a pseudo magnetic field, combined with spin-orbit coupling to form the topological one-way edge states of the polariton. On account of the ultrafast switching speed and precisely spatial controllability of the optical Stark effect, two applications, i.e., ports ratio tunable polariton splitter and programmable polariton router, were demonstrated, showing designable and rewritable functionality of all-optically controllable polariton topological insulators. This study paves the way to robustly and intelligently control/form polaritonic and spintronic devices for future classical and quantum information processing and application.
高效灵活地操控单向边缘态是将拓扑绝缘体开发为功能器件的关键。在这项工作中，我们提出了一种全光方法，利用谷选择光斯达克效应来实现可编程拓扑绝缘体。我们在单层过渡金属二卤化物中强光物质耦合产生的激子极化激元平台上构造二维蜂窝结构。光斯达克效应被诱导产生一个赝磁场，与自旋轨道耦合一起形成极化激元的拓扑单向边缘态。由于光斯达克效应的超快切换速度和精确的空间可控性，我们演示了两个应用，即端口比可调极化激元分束器和可编程极化激元路由器，展示了全光可控极化激元拓扑绝缘体的可设计和可重写功能。这项研究为未来经典和量子信息处理和应用中稳健和智能地控制/形成极化激元和自旋电子器件铺平了道路。
