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

Lopez-Bezanilla, Alejandro; Lado, J. L.

doi:10.1103/PhysRevMaterials.3.084003

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

Journal Article · Wed Aug 14 00:00:00 EDT 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.3.084003· OSTI ID:1572335

^[1]; Lado, J. L. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
ETH Zurich, Zurich (Switzerland)

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. Here, 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.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1572335

Alternate ID(s):: OSTI ID: 1557347

Report Number(s):: LA-UR-19-25467; PRMHAR; TRN: US2100213

Journal Information:: Physical Review Materials, Vol. 3, Issue 8; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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