Charge Dynamics of Vortex Cores in Layered Chiral Triplet Superconductors

TL;DR

This paper investigates the non-stationary charge response of vortex cores in layered chiral triplet superconductors to external electromagnetic fields, emphasizing impurity effects and collective mode contributions.

Contribution

It extends previous equilibrium studies to include dynamical response analysis, incorporating impurity scattering and self-consistent calculations of charge distribution.

Findings

Charge density near vortex cores is dominated by nonequilibrium bound state response.

Impurity scattering significantly broadens vortex core states and affects the electromagnetic response.

The study provides a self-consistent framework for analyzing vortex dynamics in chiral triplet superconductors.

Abstract

In an accompanying paper [arXiv:0903.0011v1] we have studied the equilibrium properties of vortices in a chiral quasi-twodimensional triplet superfluid/superconductor. Here we extend our studies to include the dynamical response of a vortex core in a chiral triplet superconductor to an external a.c. electromagnetic field. We consider in particular the response of a doubly quantized vortex with a homogeneous core in the time-reversed phase. The external frequencies are assumed to be comparable in magnitude to the superconducting gap frequency, such that the vortex motion is non-stationary but can be treated by linear response theory. We include broadening of the vortex core bound states due to impurity scattering and consider the intermediate clean regime, with a broadening comparable to or larger than the quantized energy level spacing. The response of the order parameter, impurity self energy, induced fields and currents are obtained by a self-consistent calculation of the distribution functions and the excitation spectrum. Using these results we obtain the self-consistent dynamically induced charge distribution in the vicinity of the core. This charge density is related to the nonequilibrium response of the bound states and order parameter collective mode, and dominates the electromagnetic response of the vortex core.