Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session F27: Non-Equilibrium Physics with Cold Atoms and Molecules, Rydberg Gases, and Trapped Ions I
11:30 AM–2:30 PM,
Tuesday, March 16, 2021
Sponsoring
Units:
DAMOP DCMP
Chair: David Weld, University of California, Santa Barbara
Abstract: F27.00009 : Dissipation-induced collective excitations and nonequilibrium phase transition in fermionic superfluids
1:06 PM–1:18 PM
Live
Presenter:
Kazuki Yamamoto
(Department of Physics, Kyoto University)
Authors:
Kazuki Yamamoto
(Department of Physics, Kyoto University)
Masaya Nakagawa
(Department of Physics, Unversity of Tokyo)
Naoto Tsuji
(CEMS, RIKEN)
Masahito Ueda
(Department of Physics, Unversity of Tokyo)
Norio Kawakami
(Department of Physics, Kyoto University)
In this talk, we theoretically investigate collective excitations and a nonequilibrium phase transition of fermionic superfluids driven by sudden switch-on of two-particle loss, for which we extend the BCS theory to fully incorporate quantum jumps [2]. We find that dissipation induces an amplitude oscillation of the superfluid order parameter accompanied by chirped phase rotation in a superfluid as a consequence of particle loss. We demonstrate that when dissipation is introduced to one of the two superfluids coupled via a Josephson junction, it gives rise to a nonequilibrium dissipative phase transition characterized by the vanishing dc Josephson current.
[1] A. Behrle et al., Nat. Phys. 14, 781 (2018).
[2] K. Yamamoto et al., arXiv: 2006.06169.
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