Probing the FFLO phase by double occupancy modulation spectroscopy

Abstract

We propose here that for a spin-imbalanced two-component attractive Fermi gas loaded in a 1D optical lattice in presence of an harmonic confining potential, the observation of the change in the double occupancy after a lattice depth modulation can provide clear evidence of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. Simulating the time evolution of the system, we can characterize the double occupancy spectrum for different initial conditions, relating its features to the FFLO wavevector $q$. In particular, the narrowing of the width of the spectrum can be related, through Bethe-ansatz equations in the strongly interacting limit, to the FFLO wavevector $q$.

4 pages, 6 figures

References in corpus (11)

• Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
• Pairing states of a polarized Fermi gas trapped in a one-dimensional optical lattice
• Exact quantum Monte Carlo study of one dimensional trapped fermions with attractive contact interactions
• Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi Condensates
• Exact Numerical Study of Pair Formation with Imbalanced Fermion Populations
• The FFLO state in the one-dimensional attractive Hubbard model and its fingerprint in the spatial noise correlations
• Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
• Finite temperature phase diagram of a spin-polarized ultracold Fermi gas in a highly elongated harmonic trap
• Spectral signatures of the Fulde-Ferrell-Larkin-Ovchinnikov order parameter in one-dimensional optical lattices
• Signature of the FFLO phase in the collective modes of a trapped ultracold Fermi gas
• Noise correlations of the ultra-cold Fermi gas in an optical lattice

Cited by in corpus (1)

• Collective modes and the speed of sound in the Fulde-Ferrell-Larkin-Ovchinnikov state