Comment on "Charge expulsion and electric field in superconductors"

TL;DR

This paper introduces a generalized London theory that accurately models electromagnetic responses in superconductors, satisfying the continuity equation and illustrating the Anderson-Higgs mechanism.

Contribution

It presents a novel phenomenological framework that extends the London theory to include both longitudinal and transverse electromagnetic responses in superconductors.

Findings

Correctly describes electromagnetic responses in superconductors

Satisfies the continuity equation with a special gauge

Provides an example of the Anderson-Higgs mechanism

Abstract

We propose a generalized London theory that can correctly describe the longitudinal and transverse responses of conventional superconductors to an electromagnetic field. The continuity equation is satisfied by use of a special gauge for the scalar and vector potentials. Our phenomenological theory provides a simple example of the Anderson-Higgs mechanism.