Collective Excitations and Nonequilibrium Phase Transition in Dissipative Fermionic Superfluids

• URL: http://arxiv.org/abs/2006.06169v2
• Date: Thu, 17 Jun 2021 13:41:40 GMT
• Title: Collective Excitations and Nonequilibrium Phase Transition in Dissipative Fermionic Superfluids
• Authors: Kazuki Yamamoto, Masaya Nakagawa, Naoto Tsuji, Masahito Ueda, Norio Kawakami
• Abstract summary: We predict a new mechanism to induce collective excitations and a nonequilibrium phase transition of fermionic superfluids via a sudden switch-on of two-body loss. We extend the BCS theory to fully incorporate a change in particle number.
• Score: 3.6748639131154315
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We predict a new mechanism to induce collective excitations and a nonequilibrium phase transition of fermionic superfluids via a sudden switch-on of two-body loss, for which we extend the BCS theory to fully incorporate a change in particle number. We find that a sudden switch-on of dissipation induces an amplitude oscillation of the superfluid order parameter accompanied by a chirped phase rotation 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 dynamical phase transition characterized by the vanishing dc Josephson current. The dissipation-induced collective modes and nonequilibrium phase transition can be realized with ultracold fermionic atoms subject to inelastic collisions.

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