Topological insulator laser: Theory
Topological insulator laser: Theory
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DOI：
10.1126/science.aar4003
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发表时间：
2018-03-16
期刊：
影响因子：
56.9
通讯作者：
Segev, Mordechai
中科院分区：
文献类型：
--
作者：
Harari, Gal;Bandres, Miguel A.;Segev, Mordechai
拓扑绝缘体是物质的相，其特征是以单向方式传播的拓扑边缘状态，该方式对缺陷和无序是稳健的。这些属性使拓扑绝缘体系统成为量子计算和自旋电子学应用的理想候选者。我们提出了一个以独特的方式利用拓扑效应的概念：拓扑绝缘体激光器。这些激光器的激光模式在没有磁场的情况下表现出受拓扑保护的传输。潜在的拓扑性质导致了一种高效率的激光器，即使在非常高的增益值下，也可以使用单模激光，对缺陷和无序具有很强的健壮性。拓扑绝缘体激光器改变了目前对无序和激光相互作用的理解，同时在拓扑物理中开辟了令人兴奋的可能性，例如具有增益的系统中的拓扑保护输运。在技术方面，拓扑绝缘体激光器提供了一条通往半导体激光器阵列的路径，这些半导体激光器作为一个有效耦合到输出端口的单模高功率激光器运行。
Topological insulators are phases of matter characterized by topological edge states that propagate in a unidirectional manner that is robust to imperfections and disorder. These attributes make topological insulator systems ideal candidates for enabling applications in quantum computation and spintronics. We propose a concept that exploits topological effects in a unique way: the topological insulator laser. These are lasers whose lasing mode exhibits topologically protected transport without magnetic fields. The underlying topological properties lead to a highly efficient laser, robust to defects and disorder, with single-mode lasing even at very high gain values. The topological insulator laser alters current understanding of the interplay between disorder and lasing, and at the same time opens exciting possibilities in topological physics, such as topologically protected transport in systems with gain. On the technological side, the topological insulator laser provides a route to arrays of semiconductor lasers that operate as one single-mode high-power laser coupled efficiently into an output port.