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Séminaires

Physics of atomically thin two-dimensionnal crystals - Steven G. Louie - Lundi 15 septembre 2014 à 14 h

Steven G. Louie, University of California at Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California (U.S.A)

Lundi 15 septembre 2014 à 14 h - IMPMC, Université P. et M. Curie, 4, Place Jussieu, 75005 Paris - Salle de conférence, 4e étage, Tour 22-23, Salle 1

Abstract

Experimental and theoretical studies of atomically thin quasi two-dimensional materials (typically related to some parent van der Waals layered crystals) and their nanostructures have revealed that these systems can exhibit highly unusual behaviors. In this talk, we discuss some theoretical studies of the electronic, transport and optical properties of such systems. We present results on graphene as well as other quasi 2D systems such as monolayer or few-layer transition metal dichalcogenides (e.g., MoS2, MoSe2, WS2, WSe2, …) and the metal monochalcogenides (e.g., GaSe). Owing to their reduced dimensionality, these systems present opportunities for unusual manifestation of concepts/phenomena that may not be so prominent or have not been seen in bulk materials. Symmetry and many-body interaction effects often play a critical role in shaping qualitatively and quantitatively their properties. Several novel quantum phenomena are discussed, exploring their physical origin and comparing theoretical predictions with experimental data.