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Title: High-temperature Majorana fermions in magnet-superconductor hybrid systems

Abstract

Magnet-superconductor hybrid (MSH) structures represent one of the most promising platforms to realize, control, and manipulate Majorana modes using scanning tunneling methods. By depositing either chains or islands of magnetic atoms on the surface of a conventional, elemental superconductor such as Pb or Re, topological superconducting phases can emerge. They feature either localized Majorana bound states at the chain ends or dispersing chiral Majorana modes at the island's boundary. However, some of these experiments have not reached the spectral resolution to clearly distinguish between topological Majorana and trivial Shiba states due to very small superconducting gap sizes and experiments performed at sub-Kelvin temperatures. Here we consider superconducting substrates with unconventional spin-singlet pairing, including high-temperature d -wave and extended s -wave superconductors. We derive topological phase diagrams and compute edge states for cylinder and island geometries and discuss their properties. Several time-reversal invariant topological superconducting phases of the Zhang-Kane-Mele type are found and discussed. Addiotnally, we review one-dimensional MSH structures and show that parameters to realize topologically nontrivial magnetic chains embedded into a larger, two-dimensional substrate differ from the purely one-dimensional case. Quite generally we find that unconventional superconducting substrates work as well as the conventional s -wave substrates to realizemore » topological phases. In particular, iron-based pnictide and chalcogenide superconductors are the most promising class of substrates for future high-temperature MSH systems.« less

Authors:
 [1];  [2]; ORCiD logo [2];  [1]
  1. Univ. of Melbourne (Australia)
  2. Univ. of Illinois, Chicago, IL (United States)
Publication Date:
Research Org.:
Univ. of Illinois, Chicago, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1618818
Grant/Contract Number:  
FG02-05ER46225
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 17; 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

Crawford, Daniel, Mascot, Eric, Morr, Dirk K., and Rachel, Stephan. High-temperature Majorana fermions in magnet-superconductor hybrid systems. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.174510.
Crawford, Daniel, Mascot, Eric, Morr, Dirk K., & Rachel, Stephan. High-temperature Majorana fermions in magnet-superconductor hybrid systems. United States. https://doi.org/10.1103/PhysRevB.101.174510
Crawford, Daniel, Mascot, Eric, Morr, Dirk K., and Rachel, Stephan. Tue . "High-temperature Majorana fermions in magnet-superconductor hybrid systems". United States. https://doi.org/10.1103/PhysRevB.101.174510. https://www.osti.gov/servlets/purl/1618818.
@article{osti_1618818,
title = {High-temperature Majorana fermions in magnet-superconductor hybrid systems},
author = {Crawford, Daniel and Mascot, Eric and Morr, Dirk K. and Rachel, Stephan},
abstractNote = {Magnet-superconductor hybrid (MSH) structures represent one of the most promising platforms to realize, control, and manipulate Majorana modes using scanning tunneling methods. By depositing either chains or islands of magnetic atoms on the surface of a conventional, elemental superconductor such as Pb or Re, topological superconducting phases can emerge. They feature either localized Majorana bound states at the chain ends or dispersing chiral Majorana modes at the island's boundary. However, some of these experiments have not reached the spectral resolution to clearly distinguish between topological Majorana and trivial Shiba states due to very small superconducting gap sizes and experiments performed at sub-Kelvin temperatures. Here we consider superconducting substrates with unconventional spin-singlet pairing, including high-temperature d -wave and extended s -wave superconductors. We derive topological phase diagrams and compute edge states for cylinder and island geometries and discuss their properties. Several time-reversal invariant topological superconducting phases of the Zhang-Kane-Mele type are found and discussed. Addiotnally, we review one-dimensional MSH structures and show that parameters to realize topologically nontrivial magnetic chains embedded into a larger, two-dimensional substrate differ from the purely one-dimensional case. Quite generally we find that unconventional superconducting substrates work as well as the conventional s -wave substrates to realize topological phases. In particular, iron-based pnictide and chalcogenide superconductors are the most promising class of substrates for future high-temperature MSH systems.},
doi = {10.1103/PhysRevB.101.174510},
journal = {Physical Review B},
number = 17,
volume = 101,
place = {United States},
year = {Tue May 12 00:00:00 EDT 2020},
month = {Tue May 12 00:00:00 EDT 2020}
}

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