Majorana modes with side features in magnet-superconductor hybrid systems

Daniel Crawford, Eric Mascot, Makoto Shimizu, Philip Beck, Jens Wiebe, Roland Wiesendanger, Harald O. Jeschke, Dirk K. Morr, Stephan Rachel

Research output: Contribution to journalReview articlepeer-review

Abstract

Magnet-superconductor hybrid (MSH) systems represent promising platforms to host Majorana zero modes (MZMs), the elemental building blocks for fault-tolerant quantum computers. Theoretical description of such MSH structures is mostly based on simplified models, not accounting for the complexity of real materials. Here, based on density functional theory, we derive a superconducting 80-band model to study an MSH system consisting of a magnetic manganese chain on the s wave superconductor niobium. For a wide range of values of the superconducting order parameter, the system is a topological superconductor, with MZMs exhibiting non-universal spatial patterns and a drastic accumulation of spectral weight on both sides along the magnetic chain. These side feature states can be explained by an effective model which is guided by the ab initio results. Performing scanning tunneling spectroscopy experiments on the same system, we observe a spatial structure in the low-energy local density of states that is consistent with the theoretical findings. Our results open a first-principle approach to the discovery of topological superconductors.

Original languageEnglish
Article number117
Journalnpj Quantum Materials
Volume7
Issue number1
DOIs
Publication statusPublished - Dec 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Majorana modes with side features in magnet-superconductor hybrid systems'. Together they form a unique fingerprint.

Cite this