简介: |
An ultracold gas of fermionic atoms with short range interactions represents a unique playground for studying pairing and effective interactions in a strongly correlated system due to the fine control of dimensionality and interactions. In this talk, I will start by reviewing recent theoretical and experimental progress in the field. Focussing next on the highly polarized limit of the quasi-2D Fermi gas, I will discuss properties of the quasiparticles which a single impurity can form when immersed in a Fermi sea, and the resulting ground state phase diagram as a function of mass imbalance. I will show how the ground state transition of the attractive branch is shifted by the quasi-2D confinement and how this can be described quantitatively throughout the 2D to 3D crossover. I will also demonstrate how the fast decay of the repulsive branch precludes itinerant ferromagnetism in this system.
References:
"Highly polarized limit of the quasi-two-dimensional Fermi gas”, J. Levinsen and S. K. Baur, Phys. Rev. A 86, 041602(R) (2012)
"Repulsive polarons in two-dimensional Fermi gases”, V. Ngampruetikorn, J. Levinsen, and M. M. Parish, EPL 98, 30005 (2012)
"Highly polarized Fermi gases in two dimensions", M. M. Parish and J. Levinsen, Phys. Rev. A 87, 033616 (2013) |
