Topological and edge transport in two-dimensional electron systems
- Topological insulators host topologically-protected electronic states at their two-dimensional surface. This dissertation will use low-temperature electronic transport measurements to explore basic phenomenology and several applications of these topologically-protected surface states in topological insulators and magnetically-doped topological insulators. First, it reports on the quantum anomalous Hall effect, its applications in electrical resistance and current metrology, and the microscopic details of current flow. While topological surface states are robust against disorder, the topological insulators themselves are quite inhomogeneous and fragile, so a discussion of disorder and fabrication-induced damage to these materials is presented. Next, this dissertation discusses two more elaborate types of devices incorporating topological materials: microwave devices, aimed towards developing dissipationless, passive, nonreciprocal high-frequency circuit elements, and Josephson junctions, where topological weak links provide a platform for exploring Majorana physics. Finally, this dissertation reports on measurements of a disordered thin film of a new magnetic topological insulator, where universal conductance fluctuations with a dependence on the details of magnetic domain reconfiguration are identified.
|Type of resource
|electronic resource; remote; computer; online resource
|1 online resource.
|Andersen, Molly Patricia
|Degree committee member
|Stanford University, School of Engineering
|Stanford University, Department of Materials Science and Engineering
|Statement of responsibility
|Molly Patricia Andersen.
|Submitted to the Department of Materials Science and Engineering.
|Thesis Ph.D. Stanford University 2023.
- © 2023 by Molly Patricia Andersen
- This work is licensed under a Creative Commons Attribution 3.0 Unported license (CC BY).
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