Phase structure of spin-imbalanced unitary Fermi gases

Understand

We investigate the phase structure of spin-imbalanced unitary Fermi gases beyond mean-field theory by means of the Functional Renormalization Group.

• In this approach, quantum and thermal fluctuations are resolved in a systematic manner.
• The discretization of the effective potential on a grid allows us to accurately account for both first- and second-order phase transitions that are present on the mean-field level.
• We compute the full phase diagram in the plane of temperature and spin-imbalance and discuss the existence of other conjectured phases such as the Sarma phase and a precondensation region.