Non-equilibrium Dynamics of Tunnel-Coupled Superfluids

Mubarak Alqahtani, Maxim Dzero

Oleg L. Berman, Roman Ya. Kezerashvili, G. V. Kolmakov

We review current understanding of the non-equilibrium dynamics of collective quantum systems. We describe an approach based on the Hamiltonian formulation of superfluid hydrodynamics. It is shown that, in the presence of constant energy pumping, the nonlinear coupling of fluctuations in the density and entropy strongly affects the non-equilibrium dynamics of the system. We use the results obtained to analyse the properties of out-of-equilibrium superfluid 4He and of exciton–polariton Bose–Einstein condensates, both in semiconductor quantum wells and in graphene layers in the presence of high magnetic field.

Matthew J. Davis, Tod M. Wright, Tapio Simula +2 more

Dilute gas Bose-Einstein condensates (BECs) are an example of a superfluid, and exhibit many of the same phenomena as the strongly interacting superfluid helium. However, their isolation from the environment combined with their inhomogeneous density profiles make it difficult to observe some phenomena, such as the thermo-mechanical effect, in experiments. Here we perform dynamical simulations of a finite temperature Bose-Einstein condensate coupled to spatially separated heat and particle reservoirs to observe such non-equilibrium superfluid phenomena. We analyse the resulting steady-state non-equilibrium flows in the BEC, and consider the prospect of observing sustained superfluid turbulence.

Matthew J. Davis, Tod M. Wright, Tapio Simula +2 more

Dilute gas Bose-Einstein condensates (BECs) are an example of a superfluid, and exhibit many of the same phenomena as the strongly interacting superfluid helium. However, their isolation from the environment combined with their inhomogeneous density profiles make it difficult to observe some phenomena, such as the thermo-mechanical effect, in experiments. Here we perform dynamical simulations of a finite temperature Bose-Einstein condensate coupled to spatially separated heat and particle reservoirs to observe such non-equilibrium superfluid phenomena. We analyse the resulting steady-state non-equilibrium flows in the BEC, and consider the prospect of observing sustained superfluid turbulence.

Carlos Wexler