Electronic Properties of Two-Dimensional Van Der Waals Systems

• Main Author: Gani, Yohanes Satrio
• Format: Others
• Language: English
• Published: W&M ScholarWorks 2019
• Subjects: Physics
• Online Access: https://scholarworks.wm.edu/etd/1563899012; https://scholarworks.wm.edu/cgi/viewcontent.cgi?article=6798&context=etd

In this dissertation we study the electronic structure of van der Waals systems. A van der Waals systems is a heterostructure in which the different constituents are held together by van der Waals forces. We study two different types of van der Waals systems: van der Waals systems formed by graphene and a monolayer of NbSe2, van der Waals systems obtained by placing graphene nanoribbons on a two-dimensional crystal. For the first type of systems we build a continuous low-energy effective model that takes into account the presence of a twist angle between graphene and NbSe2, and of spin-orbit coupling and superconducting pairing in NbSe2. We then obtain how the superconducting pairing induced by proximity into the graphene layer depends on the twist angle. For the second type of systems we obtain using ab-initio methods the electronic structure of graphene nanoribbons placed on hexagonal boron nitride, and of graphene nanoribbons placed on monolayers of transition metal dichalcogenide. For both cases we show how the electronic structure depends on the stacking configuration.