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Title: Stability of disordered topological superconducting phases in magnet-superconductor hybrid systems

Abstract

Magnet-superconductor hybrid heterostructures constitute a promising candidate system for the quantum engineering of chiral topological superconductivity. In this work, we investigate the stability of their topological phases in the presence of various types of potential and magnetic disorder. In particular we consider magnetic disorder in the coupling strength and spin orientation, as well as percolation-type disorder representing missing magnetic moments. We show that potential disorder leads to the weakest suppression of topological phases, while percolation disorder leads to their strongest suppression. In addition, disorder can also lead to the emergence of topological phases in part of the phase diagram that are topologically trivial in a clean system. Furthermore, we demonstrate that in the case of correlated potential disorder, the spatial structure of the disorder potential is correlated not only with the particle number density, but also the Chern number density. Finally, we demonstrate how the disorder-induced destruction of topological superconductivity is reflected in the spatial structure and distribution of the Chern number density.

Authors:
 [1];  [1];  [2]; ORCiD logo [1]
  1. Univ. of Illinois, Chicago, IL (United States)
  2. Univ. of Melbourne (Australia)
Publication Date:
Research Org.:
Univ. of Illinois, Chicago, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1618815
Grant/Contract Number:  
FG02-05ER46225
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 23; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Mascot, Eric, Agrahar, Chaitra, Rachel, Stephan, and Morr, Dirk K. Stability of disordered topological superconducting phases in magnet-superconductor hybrid systems. United States: N. p., 2019. Web. https://doi.org/10.1103/PhysRevB.100.235102.
Mascot, Eric, Agrahar, Chaitra, Rachel, Stephan, & Morr, Dirk K. Stability of disordered topological superconducting phases in magnet-superconductor hybrid systems. United States. https://doi.org/10.1103/PhysRevB.100.235102
Mascot, Eric, Agrahar, Chaitra, Rachel, Stephan, and Morr, Dirk K. Mon . "Stability of disordered topological superconducting phases in magnet-superconductor hybrid systems". United States. https://doi.org/10.1103/PhysRevB.100.235102. https://www.osti.gov/servlets/purl/1618815.
@article{osti_1618815,
title = {Stability of disordered topological superconducting phases in magnet-superconductor hybrid systems},
author = {Mascot, Eric and Agrahar, Chaitra and Rachel, Stephan and Morr, Dirk K.},
abstractNote = {Magnet-superconductor hybrid heterostructures constitute a promising candidate system for the quantum engineering of chiral topological superconductivity. In this work, we investigate the stability of their topological phases in the presence of various types of potential and magnetic disorder. In particular we consider magnetic disorder in the coupling strength and spin orientation, as well as percolation-type disorder representing missing magnetic moments. We show that potential disorder leads to the weakest suppression of topological phases, while percolation disorder leads to their strongest suppression. In addition, disorder can also lead to the emergence of topological phases in part of the phase diagram that are topologically trivial in a clean system. Furthermore, we demonstrate that in the case of correlated potential disorder, the spatial structure of the disorder potential is correlated not only with the particle number density, but also the Chern number density. Finally, we demonstrate how the disorder-induced destruction of topological superconductivity is reflected in the spatial structure and distribution of the Chern number density.},
doi = {10.1103/PhysRevB.100.235102},
journal = {Physical Review B},
number = 23,
volume = 100,
place = {United States},
year = {2019},
month = {12}
}

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