Dynamical Structure Factor of Fulde-Ferrell-Larkin-Ovchinnikov Superconductors

TL;DR

This paper theoretically investigates the dynamical structure factor of FFLO superconductors using TDGL formalism, revealing a hidden phase line accessible through quench dynamics rather than static measurements.

Contribution

It introduces a time-dependent Ginzburg-Landau approach to study the dynamical correlations in FFLO superconductors after a quench, uncovering a previously inaccessible phase line.

Findings

Quenching into the FFLO phase reveals a hidden phase boundary.

The structure factor exhibits distinctive dynamical signatures of the FFLO state.

The approach provides new insights into the phase diagram of FFLO superconductors.

Abstract

Superconductor with a spatially-modulated order parameter is known as Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconductor. Using the time-dependent Ginzburg-Landau (TDGL) formalism we have theoretically studied the temporal behaviour of the equal-time correlation function, or the structure factor, of a FFLO superconductor following a sudden quench from the unpaired, or normal, state to the FFLO state. We find that quenching into the ordered FFLO phase can reveal the existence of a line in the mean-field phase diagram which cannot be accessed by static properties.