Speaker
Dr
Andrea Fischer
(University of Cambridge, Cavendish Laboratory)
Description
We consider a gas of fermionic atoms conned to a quasi-
2D geometry by a strong harmonic confinement potential
in the transverse direction. For a two-component
population balanced system, we construct a mean field
theory for the BCS-BEC crossover, which correctly
renormalises the s-wave contact interaction and allows
infinitely many harmonic oscillator bands to be taken into
account. The two band calculation can be done
analytically giving the first order correction to the 2D
results. However, we note that pairing is strongly
modified by the presence of higher harmonic oscillator
bands, even for weak interactions and Fermi energies
much smaller than the confinement energy. We argue
that recent experiments on pairing in quasi-2D Fermi
gases [Y. Zhang et al., Phys. Rev. Lett. 108, 235302
(2012)] have already observed the expects of higher
transverse levels.
Primary author
Dr
Andrea Fischer
(University of Cambridge, Cavendish Laboratory)
