论文标题
耗散性超流体中的集体激发和非平衡相变
Collective Excitations and Nonequilibrium Phase Transition in Dissipative Fermionic Superfluids
论文作者
论文摘要
我们预测了一种新的机制，可以通过两体损失的突然开关来诱导费米子超流体的非平衡相变，为此我们扩展了BCS理论以充分整合粒子数的变化。我们发现，突然的耗散开关引起了超氟阶参数的振幅振荡，并伴随着粒子损失的结果伴随着the的相位旋转。我们证明，当将耗散引入通过约瑟夫森连接耦合的两个超丝之一引入时，它会导致非平衡的动力学相变为消失的DC Josephson电流。耗散诱导的集体模式和非平衡相变可以通过遭受非弹性碰撞的超低效率原子来实现。
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.
