Fulde-Ferrell-Larkin-Ovchinnikov State in the absence of a Magnetic Field

TL;DR

This paper demonstrates that in systems with pocket Fermi surfaces, a finite-momentum pairing state similar to FFLO can be stabilized without magnetic fields, using a two-orbital model and fluctuation exchange approximation.

Contribution

It introduces the possibility of FFLO-like states existing without magnetic fields in systems with pocket Fermi surfaces, supported by theoretical modeling.

Findings

Finite q_tot pairing states are stabilized in systems with pocket Fermi surfaces.

The stabilization depends on electron number n and Fermi surface topology.

The study uses a two-orbital model and fluctuation exchange approximation.

Abstract

We propose that in a system with pocket Fermi surfaces, a pairing state with a finite total momentum q_tot like the Fulde-Ferrell-Larkin-Ovchinnikov state can be stabilized even without a magnetic field. When a pair is composed of electrons on a pocket Fermi surface whose center is not located at Gamma point, the pair inevitably has finite q_tot. To investigate this possibility, we consider a two-orbital model on a square lattice that can realize pocket Fermi surfaces and we apply fluctuation exchange approximation. Then, by changing the electron number n per site, we indeed find that such superconducting states with finite q_tot are stabilized when the system has pocket Fermi surfaces.