PT phase transitions of edge states at PT symmetric interfaces in non-Hermitian topological insulators

• Main Authors: Ni, Xiang, Smirnova, Daria, Poddubny, Alexander, Leykam, Daniel, Chong, Yidong, Khanikaev, Alexander B.
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2019
• Subjects: DRNTU::Science::Physics; Parity-Time (PT) Symmetry; Topological Insulators
• Online Access: https://hdl.handle.net/10356/103973; http://hdl.handle.net/10220/47405
• Institution: Nanyang Technological University

We demonstrate that the parity-time (PT) symmetric interfaces formed between non-Hermitian amplifying (“gainy”) and lossy topological crystals exhibit PT phase transitions separating phases of lossless and decaying/amplifying topological edge transport. The spectrum of these interface states exhibit...