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Two-electron bound states near a Coulomb impurity in gapped graphene

De Martino, A. & Egger, R. (2017). Two-electron bound states near a Coulomb impurity in gapped graphene. Physical review B: Condensed matter and materials physics, 95(8), 85418. doi: 10.1103/PhysRevB.95.085418


We formulate and solve the perhaps simplest two-body bound-state problem for interacting Dirac fermions in two spatial dimensions. A two-body bound state is predicted for gapped graphene monolayers in the presence of weakly repulsive electron-electron interactions and a Coulomb impurity with charge Ze>0, where the most interesting case corresponds to Z=1. We introduce a variational Chandrasekhar-Dirac spinor wave function and show the existence of at least one bound state. This state leaves clear signatures accessible by scanning tunneling microscopy. One may thereby obtain direct information about the strength of electron-electron interactions in graphene.

Publication Type: Article
Additional Information: © 2017 American Physical Society
Subjects: Q Science > QA Mathematics
Departments: School of Science & Technology > Mathematics
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