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

Alejandro Lopez-Bezanilla, J. L. Lado

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)


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.
Original languageEnglish
Article number084003
Number of pages8
JournalPhysical Review Materials
Issue number8
Publication statusPublished - 14 Aug 2019
MoE publication typeA1 Journal article-refereed


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