Exploration of crystallographic defects in topological insulator metamaterials
Yamada, Sasha Seneca
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https://hdl.handle.net/2142/114109
Description
Title
Exploration of crystallographic defects in topological insulator metamaterials
Author(s)
Yamada, Sasha Seneca
Issue Date
2021-12-08
Director of Research (if dissertation) or Advisor (if thesis)
Bahl, Gaurav
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2022-04-29T21:58:41Z
Keyword(s)
Engineering
Language
eng
Abstract
Topological phases of matter have attracted the interest of physicists and engineers due to their novel transport properties and ability to protect robust states at material boundaries. These phases of matter occur when symmetries quantize and protect an invariant material property. While initially thought to be unusual behavior, computational analysis of stoichiometric materials has revealed that over 27% of all materials in nature are topologically non-trivial. The prevalence of these materials provides further cause to study their behavior; however, it remains an experimental challenge to exercise precise control of materials at an atomic level. Fortunately, the topological properties of these materials are governed by the wave-nature of electrons which allows classical analogues to be constructed from metamaterials. Such metamaterials have been constructed using mechanical, electronic, and photonic platforms to study topological phenomena. This thesis describes the construction of circuit-based resonator arrays and their application to experimentally investigate how crystallographic defects interact with a material's topology. Specifically, partial dislocation defects in multipole topological insulators are considered. It is observed that these defects can trap robust bound states at their defect core, which provides a pathway to embed protected topological states deep within the bulk of a material.
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