Pure Fulde-Ferrell-Larkin-Ovchinnikov state in optical lattices

TL;DR

This paper demonstrates the existence of a pure FFLO state in a one-dimensional optical lattice system with attractive fermions, providing a promising platform for experimental detection of this exotic superfluid phase.

Contribution

The study identifies a pure FFLO state in a 1D optical lattice with off-diagonal confinement, highlighting its experimental detectability and distinct properties.

Findings

Pure FFLO state exists in the system

Clear signatures in ground state and correlation functions

Enhanced experimental accessibility of FFLO phase

Abstract

We study the phase diagram of a one-dimensional, two-component attractive fermions on optical lattices in an off-diagonal confinement. We identify in this system a pure Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state with spatially modulated superfluidity and polarization in a large parameter window, which provides an easier playground to detect the FFLO state experimentally. The clear signature of FFLO state is analyzed in the ground state properties, the pair correlation functions, and the magnetic structure factor, using the density-matrix renormalization group method.