Semiconductor-ferromagnet-superconductor planar heterostructures for 1D topological superconductivity

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MARC

Escribano, Samuel D.Condensed Matter Physics Center (IFIMAC),Autonomous University of Madrid (author)

Semiconductor-ferromagnet-superconductor planar heterostructures for 1D topological superconductivity

Article/chapterEnglish2022

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2022-08-18
Springer Science and Business Media LLC,2022

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LIBRIS-ID:oai:lup.lub.lu.se:e0b90e06-dba8-43fb-988c-2a139c7bb344
https://lup.lub.lu.se/record/e0b90e06-dba8-43fb-988c-2a139c7bb344URI
https://doi.org/10.1038/s41535-022-00489-9DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype
Subject category:ref swepub-contenttype

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Hybrid structures of semiconducting (SM) nanowires, epitaxially grown superconductors (SC), and ferromagnetic-insulator (FI) layers have been explored experimentally and theoretically as alternative platforms for topological superconductivity at zero magnetic field. Here, we analyze a tripartite SM/FI/SC heterostructure but realized in a planar stacking geometry, where the thin FI layer acts as a spin-polarized barrier between the SM and the SC. We optimize the system’s geometrical parameters using microscopic simulations, finding the range of FI thicknesses for which the hybrid system can be tuned into the topological regime. Within this range, and thanks to the vertical confinement provided by the stacking geometry, trivial and topological phases alternate regularly as the external gate is varied, displaying a hard topological gap that can reach half of the SC one. This is a significant improvement compared to setups using hexagonal nanowires, which show erratic topological regions with typically smaller and softer gaps. Our proposal provides a magnetic field-free planar design for quasi-one-dimensional topological superconductivity with attractive properties for experimental control and scalability.

Subject headings and genre

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng

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Maiani, AndreaNiels Bohr Institute (author)
Leijnse, MartinLund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,LTH profilområde: Nanovetenskap och halvledarteknologi,LTH profilområden,Other operations, LTH,Faculty of Engineering, LTH,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Nanoscience and Semiconductor Technology,LTH Profile areas,Faculty of Engineering, LTH,Niels Bohr Institute(Swepub:lu)ftf-mls (author)
Flensberg, KarstenNiels Bohr Institute (author)
Oreg, YuvalWeizmann Institute of Science Israel (author)
Levy Yeyati, AlfredoAutonomous University of Madrid,Condensed Matter Physics Center (IFIMAC) (author)
Prada, ElsaCSIC Instituto de Ciencia de Materiales de Madrid (ICMM) (author)
Seoane Souto, RubénLund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,LTH profilområde: Nanovetenskap och halvledarteknologi,LTH profilområden,Other operations, LTH,Faculty of Engineering, LTH,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Nanoscience and Semiconductor Technology,LTH Profile areas,Faculty of Engineering, LTH,Niels Bohr Institute(Swepub:lu)ru0863se (author)
Condensed Matter Physics Center (IFIMAC)Autonomous University of Madrid (creator_code:org_t)

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