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Showing 1 to 20 of 83 for “"Topological insulators"”.
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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 transport in magnetic topological insulators
… transport behaviour in magnetically doped topological insulator (TI) materials. Magnetic TIs have been predicted to possess many exotic properties, such as the quantum anomalous Hall (QAH) effect, in which the edge states propagate adiabatically, similar to the quantum Hall effect, but …
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Theory of topological insulators and its applications
… types are in use: 1) Metals 2) Semiconductors 3) Insulators. All the three material types are classified according to the energy gap between conduction and valence bands derived from band theory of solids. Recent theoretical predictions and confirmed by experimental observations have provided …
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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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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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Topological insulators and semimetals in the presence of interactions
Topological insulators and semimetals possess the exotic gapless excitations that are governed by relativistic quantum mechanics. Due to the growing interests in these phases, the number of the materials predicted and shown to have the topological characters are continuously increasing. …
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Physics and applications of magnetic interactions in topological insulators
… and experimental discovery of a variety of topological materials over the past decade, their use in next-generation technologies remains limited. To better characterize the utility of these unique materials for engineering applications, we critically study the physics and application of …
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The Interplay of Magnetism and Topology in Topological Insulators
The conductive helical edge states in topological insulators (TIs) have been lauded over the last decade as a means towards the development of low-energy electronic and spintronic devices. Unfortunately, development of TI devices have been hampered by issues such as impurities and difficulty in …
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Quantum transport theory of 3D time-reversal invariant topological insulators
… and discovered phase of quantum matter - topological insulators (TIs), which are characterized by an insulating bulk and topologically protected, gapless, spin-momentum locked surface modes. Precise engineering of these gapless modes may yield new potential materials for novel electronic …
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Position-space and spin signatures of higher-order topological insulators
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Proximity effect in Josephson junction arrays fabricated on topological insulators
Made available in DSpace on 2021-03-05T21:36:55Z (GMT). No. of bitstreams: 2 BAI-DISSERTATION-2020.pdf: 7442590 bytes, checksum: f2366c9674c718683d0002106a938ec5 (MD5) LICENSE.txt: 4205 bytes, checksum: ff4956a5f1f17b4512ead7f1c97af426 (MD5) Previous issue date: 2020-11-06
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Terahertz Spectroscopy of Topological Insulators and other 2-Dimensional Materials
… two classes of Dirac materials - graphene and topological insulators (TIs) namely, bismuth selenide (Bi2Se3) and antimony telluride (Sb2Te3). Specifically, we investigate the optical behavior of Dirac materials using terahertz time domain spectroscopy (THz-TDS) contact-free optical technique, …
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Examining Topological Insulators and Topological Semimetals Using First Principles Calculations
The importance and promise that topological materials hold has been recently underscored by the award of the Nobel Prize in Physics in 2016 ``for theoretical discoveries of topological phase transitions and topological phases of matter." This dissertation explores the novel qualities and useful …
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The classification of topological insulators and superconductors for non-spatial and spatial symmetries
We study a topological classification of insulators and superconductors in the presence of non-spatial discrete symmetries in the Altland-Zirnbauer classification and spatial symmetries in any spatial dimension. We provide a unified method, the construction of bulk Dirac Hamiltonians in minimal …
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Disorder-driven phase transitions in weak, boundary-obstructed, and non-Hermitian topological insulators
… the effects of disorder on novel classes of topological insulators. Topological insulators are states of matter that display properties (most notably, protected anomalous edge states) that are robust to symmetry-preserving disorder. While the properties of ""classical"" tenfold way …
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Low temperature Kerr effect study of magnetic topological insulators and other magnetic structures
… interest among all spintronic materials are topological insulators (TIs), which have insulating bulk but conductive surface states. In this thesis, a comprehensive study of various TI and non-TI spintronic systems is presented, with an emphasis on the magneto-optic Kerr effect (MOKE) …
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Effects of energetic irradiation on materials and devices based on graphene and topological insulators
… and electronic properties of graphene and topological insulators and how these Dirac fermion systems interact with energetic irradiation. We first present data exploring the effects of electron-beam and oxygen plasma induced disorder on the electronic properties and Raman spectra of …
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Topological Insulators Interfaced with Trivial and Ferromagnetic Insulators. Selective contact and patterning of surface states.
Topological insulators (TIs) are a novel class of material which host helical surface states with exciting and unique electronic properties. They can provide insights into new physics and also pave the way for potential spintronic applications. Much work has been done to identify and characterise …
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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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Higher-order crystalline topology in resonator circuits
… is deformed. These fixed properties, known as topological invariants, are robust to any deformation of the material as long as it preserves both the energy gap and relevant symmetries. The discovery of materials hosting such invariants, known as topological insulators, was awarded the 2016 …
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