# Conduction Channels of an InAs-Al nanowire Josephson weak link

## TL;DR

This paper characterizes an InAs-Al nanowire Josephson junction, revealing how gate voltages tune the number and transmission of conduction channels, including achieving a single quasi-ballistic channel.

## Contribution

It provides a quantitative analysis of conduction channels and transmission coefficients in a tunable InAs-Al nanowire Josephson junction, advancing understanding of its electronic properties.

## Key findings

- Number of conduction channels can be tuned with gate voltage.
- Configurations with a single quasi-ballistic channel are achievable.
- Transmission coefficients evolve non-monotonically with gating.

## Abstract

We present a quantitative characterization of an electrically tunable Josephson junction defined in an InAs nanowire proximitized by an epitax-ially-grown superconducting Al shell. The gate-dependence of the number of conduction channels and of the set of transmission coefficients are extracted from the highly nonlinear current-voltage characteristics. Although the transmissions evolve non-monotonically, the number of independent channels can be tuned, and configurations with a single quasi-ballistic channel achieved.