Quantum Phenomena in Atomically Thin Two-Dimensional Materials
Steven G. Louie a
a University of California at Berkeley and Lawrence Berkeley National Laboratory, United States
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe September Meeting 2017 (NFM17)
SE2: Opto-electronics of 2-D Nanostructured Semiconductors: Parabolic vs. Linear Dirac Bands
Barcelona, Spain, 2017 September 4th - 9th
Organizers: Daniel Vanmaekelbergh and Cherie Kagan
Invited Speaker, Steven G. Louie, presentation 124
Publication date: 20th June 2016

Interaction and symmetry effects, as well as environmental screening effects, dominate many properties of reduced-dimensional systems and nanostructures. These effects often lead to manifestation of concepts and phenomena that may not be so prominent or have not been seen in bulk materials. In this talk, we present some 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; exchange-induced light-like (massless) exciton dispersion; tunable optical and plasmonic properties; electron supercollimation by 1D disorder in graphene and related 2D Dirac materials; and novel topological phases in graphene nanoribbons. We describe their physical origin and compare theoretical predictions with experimental results.

This work was supported in part by the National Science Foundation, the U.S. Department of Energy and the Office of Naval Research.

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