# Zero-Energy Modes from Coalescing Andreev States in a Two-Dimensional Semiconductor-Superconductor Hybrid Platform

## TL;DR

This paper explores zero-bias conductance peaks from coalescing Andreev states in a 2D semiconductor-superconductor platform, providing insights into potential Majorana zero modes with scalable device architectures.

## Contribution

It demonstrates the use of top-down lithography in 2D heterostructures to create complex, scalable hybrid devices capable of hosting Majorana-like states.

## Key findings

- Hard superconducting gap confirmed
- Ballistic tunneling contact achieved
- In-plane critical fields up to 3 T

## Abstract

We investigate zero-bias conductance peaks that arise from coalescing subgap Andreev states, consistent with emerging Majorana zero modes, in hybrid semiconductor-superconductor wires defined in a two-dimensional InAs/Al heterostructure using top-down lithography and gating. The measurements indicate a hard superconducting gap, ballistic tunneling contact, and in-plane critical fields up to $3$~T. Top-down lithography allows complex geometries, branched structures, and straightforward scaling to multicomponent devices compared to structures made from assembled nanowires.