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 | DOI (Related Dataset): | 10.21979/N9/NIRXOF | Schools: | School of Physical and Mathematical Sciences | Research Centres: | Centre for Disruptive Photonic Technologies (CDPT) | 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 |
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