Spatially-modulated Superfluid States in Fermionic Optical Ladder Systems with Repulsive Interactions

TL;DR

This paper explores how repulsive interactions in fermionic optical ladder systems lead to spatially-modulated superfluid states with d-wave symmetry, emphasizing the role of local correlations in stabilizing these states.

Contribution

It introduces a novel analysis of superfluid states in fermionic ladders with repulsive interactions using Bogoliubov-de Gennes and variational Monte Carlo methods.

Findings

Spatially-modulated spin-singlet pairs with d-wave symmetry are formed.

Local particle correlations enhance superfluid stability.

Energy gain from singlet pairing is significant in high-density regions.

Abstract

We investigate two-component ultracold fermionic atoms with repulsive interactions trapped in an optical lattice with a ladder structure. By applying the Bogoliubov-de Gennes equations to an effective t-J model in the strong correlation limit, we discuss how the spatially-modulated spin-singlet pairs with d-wave like symmetry are formed in the systems with trapping potentials. Furthermore, a close examination of the condensation energy as well as the local average of potential, kinetic and exchange energies by means of the variational Monte Carlo method elucidates that local particle correlations enhance the stability of the superfluid state via substantial energy gain due to singlet pairing in the high particle density region.