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Floquet interface states in illuminated three-dimensional topological insulators

机译:照明三维拓扑绝缘体中的浮子界面状态

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摘要

Recent experiments showed that the surface of a three-dimensional topological insulator develops gaps in the Floquet-Bloch band spectrum when illuminated with a circularly polarized laser. These Floquet-Bloch bands are characterized by nontrivial Chern numbers which only depend on the helicity of the polarization of the radiation field. Here we propose a setup consisting of a pair of counterrotating lasers, and show that one-dimensional chiral states emerge at the interface between the two lasers. These interface states turn out to be spin polarized and may trigger interesting applications in the field of optoelectronics and spintronics.
机译:最近的实验表明,当用圆偏振激光照射时,三维拓扑绝缘体的表面会在Floquet-Bloch能谱中形成间隙。这些Floquet-Bloch频带的特征在于非平凡的Chern数,其仅取决于辐射场极化的螺旋度。在这里,我们提出了一个由一对反向旋转激光器组成的装置,并表明一维手征态出现在两个激光器之间的界面上。这些界面状态被证明是自旋极化的,可能会触发光电子学和自旋电子学领域的有趣应用。

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