Friday, May 6
Time: 3:30 PM
Sumwalt 120A

Inti Sodemann
University of Texas at Austin

"Magnetic and superfluid instabilities in polarized Fermi gases"

Ultracold atomic gases have allowed access to new regimes of quantum
many body systems. In particular the realization strongly interacting
Fermi systems with imbalanced spin populations made possible the
mapping of the BCS-BEC superfluidity as the mismatch between the spin
Fermi surfaces increases. On the other hand, experiments have explored
the possibility of preparing states other than the superfluid one,
such as itinerant ferromagnetism. We have explored the impact of spin
population imbalance on the superfluid and magnetic instabilities of
the Fermi gas across the Feshbach resonance. Superfluid instabilities
dominate at small spin imbalances, but above a critical spin
polarization, density and magnetic instabilities can dominate. I will
discuss the consequences of such instabilities on experiments with
trapped gases.