# Quantized Fermi-arc-mediated transport in Weyl semimetal nanowires

## TL;DR

This paper investigates how Fermi-arc surface states influence electrical conductance in Weyl semimetal nanowires, revealing two distinct transport regimes and demonstrating their robustness against disorder.

## Contribution

It identifies and characterizes two regimes of transport in Weyl semimetal nanowires, highlighting the role of Fermi-arc surface states and their impact on conductance behavior.

## Key findings

- Surface regime shows quantized conductance steps with flux oscillations.
- Bulk-surface regime exhibits quadratic conductance dependence on chemical potential.
- Both regimes are robust to disorder effects.

## Abstract

We study longitudinal transport in Weyl semimetal nanowires, both in the absence and in the presence of a magnetic flux threading the nanowires. We identify two qualitatively different regimes of transport with respect to the chemical potential in the nanowires. In the "surface regime", for low doping, most of the conductance occurs through the Fermi-arc surface states, and it rises in steps of one quantum of conductance as a function of the chemical potential; furthermore, with varying flux the conductance changes in steps of one quantum of conductance with characteristic Fabry-P\'erot interference oscillations. In the "bulk-surface regime", for highly-doped samples, the dominant contribution to the conductance is quadratic in the chemical potential, and mostly conditioned by the bulk states; the flux dependence shows clearly that both the surface and the bulk states contribute. The two aforementioned regimes prove that the contribution of the Fermi-arc surface states is salient and, therefore, crucial for understanding transport properties of finite-size Weyl semimetal systems. Last but not least, we demonstrate that both regimes are robust to disorder.