Two-leg fermionic Hubbard ladder system in the presence of state-dependent hopping

TL;DR

This paper investigates a two-leg fermionic Hubbard ladder with state-dependent hopping, revealing new phases such as spin-triplet superfluid, spin-density wave, and charge-density wave, with implications for cold atom experiments.

Contribution

It introduces the effects of state-dependent hopping in the Hubbard ladder, uncovering novel phases not present in the standard model.

Findings

Discovery of spin-triplet superfluid phase

Emergence of spin-density wave and charge-density wave phases

Protocols for realizing elusive spin-triplet superfluid in cold atoms

Abstract

We study a two-leg fermionic Hubbard ladder model with a state-dependent hopping. We find that, contrary to the case without a state-dependent hopping, for which the system has a superfluid nature regardless of the sign of the interaction at incommensurate filling, in the presence of such a hopping a spin-triplet superfluid, spin- density wave and charge-density wave phases emerge. We examine our results in the light of recent experiments on periodically-driven optical lattices in cold atoms. We give protocols allowing us to realize the spin-triplet superfluid elusive in the cold atoms.