The fractional quantum Hall effect has been predicted theoretically for a two-dimensional condensate rotating at a frequency matching that of the confining harmonic trap. However, the strongly-correlated regime has eluded experimentalists in cold quantum gases due to two problems: it is difficult to confine condensates at rotation speeds matching the trapping frequency and vortex shears destroy condensates at high rotation. We have shown a potential solution to be the use of a two dimensional lattice. Introducing a co-rotating optical lattice in the tight-binding regime, in which particles on a lattice site can only tunnel to adjacent sites, provides strong confinement and enhances interactions to enable entry into the strongly-correlated regime.
10 Minute Talk: RF spectroscopy of a strongly interacting Fermi gas in the normal phase: Polarons vs. Molecules