2013/12/24 by Sanjoy Datta, Viveka Nand Singh, Pinaki Majumdar
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physreva.89.053609
this article supersedes arXiv:1104.4912
arxiv created 2013/12/24 · arxiv updated 2015/06/18
Attractive interaction between fermions can lead to pairing and superfluidity in an optical lattice. In contrast to the `continuum', on a lattice the trap induced density variation can generate a non monotonic profile of the pairing amplitude, and completely modify the spectral signatures of any possible pseudogap phase. Using a tool that fully captures the inhomogeneity and strong thermal fluctuations, we demonstrate how the crucial radio frequency signatures of pairing are `inverted' in a trapped attractive fermion lattice compared to the traditional continuum case. These features would be central in interpreting any spectroscopic hint of fermion pairing and superfluidity.