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

Mascot, Eric; Agrahar, Chaitra; Rachel, Stephan; Morr, Dirk K.

doi:10.1103/PhysRevB.100.235102

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

Journal Article · 01 December 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.235102 · OSTI ID:1618815

Mascot, Eric ^[1]; Agrahar, Chaitra ^[1]; Rachel, Stephan ^[2];

^[1]

Univ. of Illinois, Chicago, IL (United States)
Univ. of Melbourne (Australia)

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.

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Research Organization:: Univ. of Illinois, Chicago, IL (United States); University of Illinois, Chicago, IL (United States)

Sponsoring Organization:: Australian Research Council; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46225

OSTI ID:: 1618815

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 23 Vol. 100; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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