Cristin-resultat-ID: 1832802
Sist endret: 21. januar 2021 17:46
NVI-rapporteringsår: 2020
Resultat
Vitenskapelig artikkel
2020

Possible odd-frequency Amperean magnon-mediated superconductivity in topological insulator–ferromagnetic insulator bilayer

Bidragsytere:
  • Henning Goa Hugdal og
  • Asle Sudbø

Tidsskrift

Physical review B (PRB)
ISSN 2469-9950
e-ISSN 2469-9969
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2020
Publisert online: 2020
Trykket: 2020
Volum: 102
Hefte: 12
Artikkelnummer: 125429
Open Access

Importkilder

Scopus-ID: 2-s2.0-85092909911

Klassifisering

Vitenskapsdisipliner

Kondenserte fasers fysikk

Emneord

Topologisk materie • Ukonvensjonell superledning

Beskrivelse Beskrivelse

Tittel

Possible odd-frequency Amperean magnon-mediated superconductivity in topological insulator–ferromagnetic insulator bilayer

Sammendrag

We study the magnon-mediated pairing between fermions on the surface of a topological insulator (TI) coupled to a ferromagnetic insulator with a tilted mean field magnetization. Tilting the magnetization toward the interfacial plane reduces the magnetic band gap and leads to a shift in the effective TI dispersions. We derive and solve the self-consistency equation for the superconducting gap in two different situations, where we neglect or include the frequency dependence of the magnon propagator. Neglecting the frequency dependence results in p-wave Amperean solutions. We also find that tilting the magnetization into the interface plane favors Cooper pairs with center-of-mass momenta parallel to the magnetization vector, increasing Tc compared to the out-of-plane case. Including the frequency dependence of the magnon propagator, and solving for a low number of Matsubara frequencies, we find that the eigenvectors of the Amperean solutions at the critical temperature are dominantly odd in frequency and even in momentum, thus opening the possibility for odd-frequency Amperean pairing.

Bidragsytere

Henning Goa Hugdal

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk ved Norges teknisk-naturvitenskapelige universitet

Asle Sudbø

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk ved Norges teknisk-naturvitenskapelige universitet
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