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Title: Emergent PT -symmetry breaking of collective modes with topological critical phenomena
Authors: Pan, Jian-Song 
Yi, Wei
Gong, Jiangbin 
Issue Date: 1-Dec-2021
Publisher: Nature Research
Citation: Pan, Jian-Song, Yi, Wei, Gong, Jiangbin (2021-12-01). Emergent PT -symmetry breaking of collective modes with topological critical phenomena. Communications Physics 4 (1) : 261. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: The spontaneous breaking of parity-time (PT) symmetry yields rich critical behavior in non-Hermitian systems, and has stimulated much interest, albeit most previous studies were performed within the single-particle or mean-field framework. Here, by studying the collective excitations of a Fermi superfluid with PT-symmetric spin-orbit coupling, we uncover an emergent PT-symmetry breaking in the Anderson-Bogoliubov (AB) collective modes, even as the superfluid ground state retains an unbroken PT symmetry. The critical point of the transition is marked by a non-analytic kink in the speed of sound, which derives from the coalescence and annihilation of the AB mode and its hole partner, reminiscent of the particle-antiparticle annihilation. The system consequently becomes immune to low-frequency external perturbations at the critical point, a phenomenon associated with the spectral topology of the complex quasiparticle dispersion. This critical phenomenon offers a fascinating route toward perturbation-free quantum states. © 2021, The Author(s).
Source Title: Communications Physics
ISSN: 2399-3650
DOI: 10.1038/s42005-021-00762-6
Rights: Attribution 4.0 International
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