Please use this identifier to cite or link to this item: https://doi.org/10.1038/s42005-021-00762-6
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dc.titleEmergent PT -symmetry breaking of collective modes with topological critical phenomena
dc.contributor.authorPan, Jian-Song
dc.contributor.authorYi, Wei
dc.contributor.authorGong, Jiangbin
dc.date.accessioned2022-10-11T07:44:37Z
dc.date.available2022-10-11T07:44:37Z
dc.date.issued2021-12-01
dc.identifier.citationPan, 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. https://doi.org/10.1038/s42005-021-00762-6
dc.identifier.issn2399-3650
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/231893
dc.description.abstractThe 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).
dc.publisherNature Research
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.sourceScopus OA2021
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1038/s42005-021-00762-6
dc.description.sourcetitleCommunications Physics
dc.description.volume4
dc.description.issue1
dc.description.page261
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