CField Theory

Low-dimensional stochastic projected GPE

Quantum many body systems relevant for ultra-cold gases have vast Hilbert spaces making exact quantum dynamics infeasible. We have developed practical methods for describing high-temperature Bose gases. These c-field methods are able to describe quantum dynamics of $10^6$ atoms at temperatures ranging from $\sim T_c$ down to well below the transition temperature. The theory allows description of Kibble-Zurek physics and rich dynamics of quantum quenches trapping vortices and other topological excitations including dark solitons.

Ultra-cold gases are, of course, rather susceptible the thermal energy, necessitating a detailed quantitative theoretical treatment of reservoir interactions. We have developed new methods for describing reservoir interactions for spinor gases and matter-waves systems confined to reduced dimension. Dissipation is crucial for understanding dynamics of vortices, solitons, and collective modes in experiments.

Ashton Bradley
Ashton Bradley
Associate Professor of Physics

My interests including condensed matter, degenerate gases, hydrodynamics, atomic physics, quantum optics and quantum information.