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Stochastic Superfluids

Inverse Energy Cascade

Group Leader: Associate Professor Ashton Bradley

Ideal superfluidity is a quantum state of matter whereby fluid motion occurs without viscousity, allowing persistent currents to flow essentially indefinitely. Superfluids can also support long-lived coherent excitations such as vortices and solitons that contain angular and linear momentum respectively. An essential element of atomic gas superfluids is the presence of a thermal fraction of the gas that fundamentally alters the superfluid motion, especially for systems far from equilibrium, or near a critical point.

Classical field methods offer a powerful theoretical approach for handling the dynamics of superfluids at high temperature. A very wide range of non-equilibrium superfluid phenomena are tractable within this framework, including the Bose-Einstein condensation transition. The interplay between thermal fluctuations, quantum viscousity, and interparticle interactions provides a rich setting for the study of emergent phenomena in dynamical superfluidity, and for the accurate modeling of current experiments.

We are currently focused on three main areas:

  1. Two dimensional quantum turbulence. -Quantum vortices in two dimensional superfluids offer a new window into the complex phenomena of turbulence.
  2. Decay of superfluid excitations. - Nonlinear excitations such as vortices and solitons offer new insights into the dissipative behavior of superfluids.
  3. Generalized C-field theory. -The C-field theory can be generalized to more complex systems such as spinor condensates with additional degrees of freedom.

For more information visit my Research Group.