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Direct evidence for efficient ultrafast charge separation in epitaxial WS2/graphene heterostructures

Aeschlimann, Sven ; Rossi, Antonio ; Chávez-Cervantes, Mariana ; Krause, Razvan ; Arnoldi, Benito ; Stadtmüller, Benjamin ; Aeschlimann, Martin ; Forti, Stiven ; Fabbri, Filippo ; Coletti, Camilla ; Gierz, Isabella


We use time- and angle-resolved photoemission spectroscopy (tr-ARPES) to investigate ultrafast charge transfer in an epitaxial heterostructure made of monolayer WS2 and graphene. This heterostructure combines the benefits of a direct-gap semiconductor with strong spin-orbit coupling and strong light-matter interaction with those of a semimetal hosting massless carriers with extremely high ...


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