Expansion dynamics of the Fulde-Ferrell-Larkin-Ovchinnakov state

Jussi Kajala, Francesco Massel, Päivi Törmä

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)
256 Downloads (Pure)

Abstract

We consider a two-component Fermi gas in the presence of spin imbalance, modeling the system in terms of a one-dimensional attractive Hubbard Hamiltonian initially in the presence of a confining trap potential. With the aid of the time-evolving block decimation method, we investigate the dynamics of the initial state when the trap is switched off. We show that the dynamics of a gas initially in the Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state is decomposed into the independent expansion of two fluids, namely the paired and the unpaired particles. In particular, the expansion velocity of the unpaired cloud is shown to be directly related to the FFLO momentum. This provides an unambiguous signature of the FFLO state in a remarkably simple way.
Original languageEnglish
Article number041601
Pages (from-to)1-4
Number of pages4
JournalPhysical Review A
Volume84
Issue number4
DOIs
Publication statusPublished - 10 Oct 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • expansion dynamics
  • the Fulde-Ferrell-Larkin-Ovchinnikov state

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