Edge Modes, Degeneracies, and Topological Numbers in Non-Hermitian Systems

• Main Authors: Chong, Yi Dong, Nori, Franco, Leykam, Daniel, Bliokh, Konstantin Y., Huang, Chunli
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2017
• Subjects: Honeycomb structures; Linear equations
• Online Access: https://hdl.handle.net/10356/83306; http://hdl.handle.net/10220/42547
• Institution: Nanyang Technological University

We analyze chiral topological edge modes in a non-Hermitian variant of the 2D Dirac equation. Such modes appear at interfaces between media with different “masses” and/or signs of the “non-Hermitian charge.” The existence of these edge modes is intimately related to exceptional points of the bulk Ha...