Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 68 for “"topological insulator"”.
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Photoemission Spectroscopy Studies of New Topological Insulator Materials
… to classify the electron band structures. The topological insulator phase yields an exotic metal surface state in which the orientation of the electron’s spin is locked perpendicular to its momentum. This property suppresses backscattering (making it possible to pass spin-polarized currents …
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Exploration of crystallographic defects in topological insulator metamaterials
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-12-01
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Quantum Computation in Ultra-thin Topological Insulator Films
… for quantum computation. The recently discovered topological insulator (TI) has been proposed as a useful material potentially for spintronics and quantum computation owing to its unique topologically-protected surface states. In this thesis, we will investigate theoretically and numerically …
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Epitaxial growth and plasmonic coupling in topological insulator heterostructures
Three-dimensional (3D) topological insulator (TI) belongs to the group of quantum spin Hall insulators that exhibit helical superconducting surface states and insulating bulk states. Electrons occupying these surface states are two-dimensional (2D) massless, linear dispersed, and spin-momentum …
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Unconventional superconductivity in topological insulator and magnetic Josephson junctions
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Investigation of current-phase relation in topological insulator Josephson junction
In this thesis, we present current-phase relation (CPR) study of S-TI-S lateral Josephson junction (TIJJ). In a magnetic field, localized Majorana bound states (MBS) are predicted to exist at the core of Josephson vortices. One of the key characteristics of such MBS in TIJJ system is that they …
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Low-temperature magneto-transport study of topological insulator-magnetic material heterostructures
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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The physics of multilayer topological insulator heterostructures using low-energy models
… of multilayer heterostructures grown from topological insulators (TIs), primarily bismuth selenide and antimony telluride, and other topologically trivial materials. This is done by extending a standard low-energy 3D TI Hamiltonian and varying its associated material parameters across the …
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Room temperature spin-orbit torque switching induced by a topological insulator
Recent studies on the topological insulators have attracted great attention due to the rich spin-orbit physics and promising applications in spintronic devices. The strongly spin-moment coupled electronic states have been extensively pursued to realize efficient spin-orbit torque switching. …
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Polarization dependent photocurrents in thin films of the topological insulator Bi₂Se₃
Topological insulators are a new class of three-dimensional quantum materials whose interior or bulk is an insulator but whose surface is a conductor. Bi₂Se₃ is a prototypical topological insulator that physicists at MIT are manufacturing and studying. Various interesting properties of the …
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Theoretical study of Kondo effect and related transport properties in topological insulator systems
… Kondo effect and related transport properties in topological insulator systems. The thesis mainly covers two topics: the Kondo effect on the surface of a bulk topological insulator material and the Kondo effect in a topological insulator quantum dot. Other relevant background knowledge and …
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Scanning tunneling microscopy studies of a tunable topological insulator and magnetic Weyl semimetal
The discovery of topological order with material systems, and the unique electronic states necessitated by non-trivial topology, has been a major thrust of condensed matter research for the past two decades. As exotic topological electronic states often manifest themselves at reduced dimensional …
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Nonequilibrium green function approach to elastic and inelastic spin-charge transport in topological insulator-based heterostructures and magnetic tunnel junctions
… coupling (SOC) at the interface of the FM and insulator. Assuming that the measured signals are quantum mechanical effect where a solution to the time dependent Schrodinger equation is required, I use Keldysh Green function formalism to introduce a "multi-photon" approach which takes into …
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Investigation of magnetic interactions in topological insulators
Topological insulators are a category of phases in condensed matter with inverted conduction and valence bands, which is protected by time reversal symmetry. As a result, the bulk keeps insulating while the surface supports an exotic high-mobility spin-polarized electronic states. Introducing …
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Interaction effects in topological insulators
… to study the shortrange interaction effects in topological insulators. We start with the Kane-Mele model on the decorated honeycomb lattice and study the stability of topological insulator phase against different perturbations. We establish an adiabatic connection between a noninteracting …
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Quantum electronic transport in atomically layered topological insulators
… condensed matter, beginning with the notion of topological insulators (TIs) for electronic systems. For the time-reversal invariant TIs, a key aspect is the "helical" mode at the boundary of the system - that is, the ID edge of a 2D topological insulator or the 2D surface of a 3D topological …
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Probing proximity-induced superconductivity in Nb- Bi2Se3 bilayers with low-temperature transport and Josephson interferometry
Superconductors and topological insulators are two condensed matter systems that differ at the most fundamental level. Superconductors, discovered serendipitously, spontaneously break gauge symmetry. In contrast, topological insulators are defined by a topological invariant of their band structure. …
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Scanning tunneling microscopy and spectroscopy of topological materials and heterostructures in thin films and devices
… 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 …
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The superconducting proximity effect in Bi2Se3 thin-films
… com-putational devices. In this work, the topological insulator Bi2Se3, which supports special metallic surface states as a consequence of the topology of its bulk bands, is tiled with micron-scale islands of the superconductor niobium. The superconducting islands interact with the Bi2Se3 …
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Angle-resolved photoemission and first-principles studies of topological semimetals and heterostructures
Topologically nontrivial systems are electronic materials that have protected conducting states on their edge or surface. These widely studied materials are of great interest due to their exotic physical properties and potential for applications in spin-related electronic devices and quantum …
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