University of Illinois Urbana-Champaign

Scanning tunneling microscopy and spectroscopy of topological materials and heterostructures in thin films and devices

Maximenko, Yulia

Content Files
MAXIMENKO-DISSERTATION-2020.pdf

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https://hdl.handle.net/2142/108241

Description

Title
Scanning tunneling microscopy and spectroscopy of topological materials and heterostructures in thin films and devices
Author(s)
Maximenko, Yulia
Issue Date
2020-04-06
Director of Research (if dissertation) or Advisor (if thesis)
Madhavan, Vidya
Doctoral Committee Chair(s)
Eckstein, James
Committee Member(s)
  • Hughes, Taylor
  • Kwiat, Paul
  • Stack, John
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Date of Ingest
2020-08-27T00:49:52Z
Keyword(s)
scanning tunneling microscopy, topological insulators, back gating, monolayer, molecular beam epitaxy
Abstract
This dissertation reports the results of scanning tunneling microscopy experiments probing the physics of thin films of topological materials. A 3D topological insulator Bi2Te3 and a 2D topological insulator WTe2, grown epitaxially, are studied with atomic resolution, and their physics is probed using in-situ back gating. The development of the back-gating process in a scanning tunneling microscope is one of the main results of this work and is reported in detail. The band structure of the monolayer WTe2 is observed to be drastically changing upon the application of electric field through the back gate. The complex effect of the gate-induced electric field on monolayer WTe2 is explored and discussed. A study of the spatial extent of 1D edge states of WTe2 is presented. A new process combining nanopatterned superconductors and topological materials is proposed and implemented. The proposed geometry in devices suitable for scanning tunneling microscopy studies opens up many new possibilities to explore the proximity effect in topological materials for future Majorana platform realization.
Graduation Semester
2020-05
Type of Resource
Thesis
Permalink
http://hdl.handle.net/2142/108241
Copyright and License Information
Copyright 2020 Yulia Maximenko

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