The Fascinating Quantum World of Two-dimensional Materials: Interaction and Topological Effects
Prof. Steven G. Louie
Recorded 21 July 2017 in Lausanne, Vaud, Switzerland
Interaction, symmetry and topological effects, as well as environmental screening, dominate many properties of reduced-dimensional systems and nanostructures. These effects often lead to manifestation of counter-intuitive concepts and phenomena that may not be so prominent or have not been seen in bulk materials. In this talk, I present some fascinating new physical phenomena found in recent theoretical and computational studies of atomically thin two-dimensional materials. A number of highly interesting and unexpected phenomena have been discovered – e.g., strongly bound excitons with unusual energy level structures and optical selection rules; light-like (massless) exciton dispersion; tunable optical, magnetic and plasmonic properties; electron supercollimation by 1D disorder; and novel topological phases. We describe their physical origin and compare theoretical predictions with experimental results when available.
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