PT-Symmetric Topological Edge-Gain Effect.,Physical Review Letters

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PT-Symmetric Topological Edge-Gain Effect.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-14 , DOI: 10.1103/physrevlett.125.033603
Alex Y Song ₁ , Xiao-Qi Sun ₂ , Avik Dutt ₁ , Momchil Minkov ₁ , Casey Wojcik ₁ , Haiwen Wang ₃ , Ian A D Williamson ₁ , Meir Orenstein ₄ , Shanhui Fan ₁

Affiliation

We demonstrate a non-Hermitian topological effect that is characterized by having complex eigenvalues only in the edge states of a topological material, despite the fact that the material is completely uniform. Such an effect can be constructed in any topological structure formed by two gapped subsystems, e.g., a quantum spin-Hall system, with a suitable non-Hermitian coupling between the spins. The resulting complex-eigenvalued edge state is robust against defects due to the topological protection. In photonics, such an effect can be used for the implementation of topological lasers, in which a uniform pumping provides gain only in the edge lasing state. Furthermore, such a topological lasing model is reciprocal and is thus compatible with standard photonic platforms.

中文翻译：

PT对称拓扑边缘增益效应。

我们展示了一种非埃尔米特拓扑效应，其特征是仅在拓扑材料的边缘状态下才具有复杂的特征值，尽管事实上该材料是完全均匀的。可以在由两个有间隙的子系统（例如，量子自旋霍尔系统）形成的任何拓扑结构中构造这种效应，在自旋之间具有合适的非Hermitian耦合。所得到的复特征值边缘状态对于由于拓扑保护而引起的缺陷具有鲁棒性。在光子学中，这种效应可用于实现拓扑激光器，其中均匀泵浦仅在边缘激光发射状态下提供增益。此外，这种拓扑激射模型是相互的，因此与标准光子平台兼容。

更新日期：2020-07-14

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