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Séminaire Théorie : vendredi 12 janvier 2024 à 11h00

Quentin Marsal (Uppsala University)

Titre : Chiral disorder and quantum metric in graphene

LPMMC, Salle G421


Résumé : Random vacancies in a graphene monolayer induce defect states that are known to form a narrow impurity band centered around zero energy at half-filling. We use a space-resolved formulation of the quantum metric and establish a strong enhancement of the electronic correlations in this impurity band. The enhancement is primarily due to strong correlations between pairs of vacancies situated on different sublattices at anomalously large spatial distances. We trace the strong enhancement to both the multifractal vacancy wave functions, which ties the system exactly at the Anderson insulator transition for all defect concentrations, and preserving the chiral symmetry.