TWO-DIMENSIONAL MATERIALS: FROM BERRY CURVATURE TO WRAPPING A MICROSPHERE
McGill, Kathryn Lorraine
The study of atomically-thin, truly two-dimensional (2D) materials has morphed into its own field since the experimental isolation of graphene and similar 2D materials in 2005. Graphene, as a single layer of carbon atoms with a unique band structure, and monolayer molybdenum disulfide (MoS<sub>2</sub>), a three-atom-thick semiconductor, have been of particular interest both for the physics accessible in 2D crystals and the applications achievable with highly flexible materials. This dissertation presents a variety of experiments exploring the optoelectronic and mechanical properties of both monolayer MoS<sub>2</sub> and graphene. In particular, we present three studies: (1) the experimental realization of the valley Hall effect, an effect based on the Berry curvature of a material’s energy bands, in monolayer MoS<sub>2</sub>; (2) methods for directly measuring the bending stiffness of graphene (and related 2D materials); and (3) an investigation of the wrapping of micro-spherical droplets by monolayer MoS<sub>2</sub>. We conclude by discussing the future outlook of both "valleytronics" and microencapsulation by 2D materials.
Graphene; bending stiffness; molybdenum disulfide; valley Hall effect; wrapping; Physics; 2D materials; Nanotechnology; Nanoscience
McEuen, Paul L.
Arias, Tomas A.; Ralph, Daniel C.
Ph. D., Physics
Doctor of Philosophy
Attribution-NonCommercial-ShareAlike 4.0 International
dissertation or thesis
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