Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/145069
Title: Non-Hermitian dirac cones
Authors: Xue, Haoran
Wang, Qiang
Zhang, Baile
Chong, Yidong
Keywords: Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Optics
Science::Physics
Issue Date: 2020
Source: Xue, H., Wang, Q., Zhang, B., & Chong, Y. (2020). Non-Hermitian dirac cones. Physical Review Letters, 124(23), 236403-. doi:10.1103/PhysRevLett.124.236403
Project: MOE2016-T3-1-006
RG187/18
MOE 2018-T2-1-022
Journal: Physical Review Letters
Abstract: Non-Hermitian systems containing gain or loss commonly host exceptional point degeneracies, not the diabolic points that, in Hermitian systems, play a key role in topological transitions and related phenomena. Non-Hermitian Hamiltonians with parity-time symmetry can have real spectra but generally nonorthogonal eigenstates, impeding the emergence of diabolic points. We introduce a pair of symmetries that induce not only real eigenvalues but also pairwise eigenstate orthogonality. This allows non-Hermitian systems to host Dirac points and other diabolic points. We construct non-Hermitian models exhibiting three exemplary phenomena previously limited to the Hermitian regime: Haldane-type topological phase transition, Landau levels without magnetic fields, and Weyl points. This establishes a new connection between non-Hermitian physics and the rich phenomenology of diabolic points.
URI: https://hdl.handle.net/10356/145069
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.124.236403
Rights: © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

Files in This Item:
File Description SizeFormat 
Non-Hermitian dirac cones.pdf1.32 MBAdobe PDFView/Open

SCOPUSTM   
Citations 20

3
Updated on Mar 10, 2021

PublonsTM
Citations 50

2
Updated on Mar 7, 2021

Page view(s)

21
Updated on May 14, 2021

Download(s)

9
Updated on May 14, 2021

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.