Exotic Pairing in Strongly Interacting Ultracold Fermi Gases at High Densities

Professor Qijin Chen

Department of Physics, Zhejiang University, Hangzhou, China

2:00 pm Friday, 23 August 2013, EN102, EN Building, Hawthorn.

In this talk I will discuss the exotic pairing phenomena in strongly interacting ultracold atomic Fermi gases, in the high density regime. We find that, as the interaction strength increases from weak to strong, at effectively high densities, the superfluid transition temperature Tc vanishes at intermediate pairing strengths, where ordinary BCS-type ground states give way to an exotic pair density wave or Bose metal state, and then may (or may not) recover as the pairing strength further increases. Such behaviors exist for both long range s-wave pairing in a 3D continuum and s/d-wave pairing on a lattice at high densities, as well as p-wave pairing with dipole-dipole interactions. If time permits, I will discuss briefly the exotic pairing phenomena in a Fermi-Fermi mixture such as 6Li--40K, including unusual triple-layered phase separation along with pseudogap phenomena in traps, as well as a substantially enlarged phase space for the Fulde-Ferrell-Larkin-Ovchinnikov state in the homogeneous case.

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