# Observability of surface currents in p-wave superconductors

## TL;DR

This paper develops a theoretical framework using quasiclassical formalism to analyze spontaneous surface currents in chiral p-wave superconductors, proposing that muSR measurements can reveal pairing symmetry.

## Contribution

It introduces a comprehensive approach to describe surface current distributions considering surface roughness and metallic layers, linking observable currents to pairing symmetry.

## Key findings

- Calculated angle-resolved surface current distributions.
- Identified conditions for the observability of surface currents.
- Proposed muSR as a method to infer pairing symmetry.

## Abstract

A general approach is formulated to describe spontaneous surface current distribution in a chiral p-wave superconductor. We use the quasiclassical Eilenberger formalism in the Ricatti parametrization to describe various types of the superconductor surface, including arbitrary roughness and metallic behaviour of the surface layer. We calculate angle resolved distributions of the spontaneous surface currents and formulate the conditions of their observability. We argue that local measurements of these currents by muSR technique may provide an information on the underlying pairing symmetry in the bulk superconductor.