Finite temperature stability and dimensional crossover of exotic superfluidity in lattices

M.O.J Heikkinen, D.-H. Kim, P. Törmä

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)
290 Downloads (Pure)

Abstract

We investigate exotic paired states of spin-imbalanced Fermi gases in anisotropic lattices, tuning the dimension between one and three. We calculate the finite temperature phase diagram of the system using real-space dynamical mean-field theory in combination with the quantum Monte Carlo method. We find that regardless of the intermediate dimensions examined, the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state survives to reach about one third of the BCS critical temperature of the spin-density balanced case. We show how the gapless nature of the state found is reflected in the local spectral function. While the FFLO state is found at a wide range of polarizations at low temperatures across the dimensional crossover, with increasing temperature we find out strongly dimensionality-dependent melting characteristics of shell structures related to harmonic confinement. Moreover, we show that intermediate dimension can help to stabilize an extremely uniform finite temperature FFLO state despite the presence of harmonic confinement.
Original languageEnglish
Article number224513
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B
Volume87
Issue number22
DOIs
Publication statusPublished - Jun 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • DMFT
  • FFLO
  • Hubbard model
  • Ultracold gases

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