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https://doi.org/10.1038/s42005-021-00762-6
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. https://doi.org/10.1038/s42005-021-00762-6 | 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 | URI: | https://scholarbank.nus.edu.sg/handle/10635/231893 | ISSN: | 2399-3650 | DOI: | 10.1038/s42005-021-00762-6 | Rights: | Attribution 4.0 International |
Appears in Collections: | Elements Staff Publications |
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