Pairing in 2D Fermi gases
Quasi-two-dimensional Fermi systems are of both fundamental interest and technological importance, with graphene and the high-temperature superconductors being classic examples. Recent advances in cold-atom experiments have now made it possible to investigate model quasi-2D Fermi gases in a controlled manner. In this talk, I will discuss the different pairing regimes in the attractive Fermi gas and how these can be dramatically modified by the finite transverse width of the quasi-2D system. In particular, I will show that the critical temperature for pairing and superfluidity can be enhanced by relaxing the transverse confinement and perturbing away from the 2D limit, thus raising the tantalising possibility that superfluidity is most favourable when the gas lies between 2D and 3D.
 V. Ngampruetikorn, J. Levinsen & M. M. Parish, Phys. Rev. Lett. 111, 265301 (2013)
 M. Bauer, M. M. Parish & T. Enss, Phys. Rev. Lett. 112, 135302 (2014)
 A. M. Fischer & M. M. Parish, Phys. Rev. B 90, 214503 (2014)