Defect-induced magnetism and Yu-Shiba-Rusinov states in twisted bilayer graphene

Alejandro Lopez-Bezanilla, J. L. Lado

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

4 Sitaatiot (Scopus)

Abstrakti

Atomic defects have a significant impact on the low-energy properties of graphene systems. By means of first-principles calculations and tight-binding models we provide evidence that chemical impurities modify both the normal and the superconducting states of twisted bilayer graphene. A single hydrogen atom attached to the bilayer surface yields a triple-point crossing, whereas self-doping and threefold symmetry breaking are created by a vacant site. Both types of defects lead to time-reversal symmetry breaking and the creation of local magnetic moments. Hydrogen-induced magnetism is found to exist also at the doping levels where superconductivity appears in magic-angle graphene superlattices. As a result, the coexistence of superconducting order and defect-induced magnetism yields in-gap Yu-Shiba-Rusinov excitations in magic-angle twisted bilayer graphene.
AlkuperäiskieliEnglanti
Artikkeli084003
Sivumäärä8
JulkaisuPhysical Review Materials
Vuosikerta3
Numero8
DOI - pysyväislinkit
TilaJulkaistu - 14 elokuuta 2019
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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