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.
Results
Showing 1 to 17 of 17 for “"Topological semimetals"”.
-
Topological semimetals and nodal superconductors
Besides topological band insulators, which have a full bulk gap, there are also gapless phases of matter that belong to the broad class of topological materials, such as topological semimetals and nodal superconductors. We systematically study these gapless topological phases described by the Bloch …
-
Higher order topological semimetals and superconductors
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
-
Crystalline-electromagnetic responses of topological semimetals and insulators
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
-
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 …
-
Implications of Vorticity and Disorder on Quantum Transport in Topological Semimetals
The study of quantum materials with topologically nontrivial band structures has revealed a wide range of unconventional responses to external perturbations. In this dissertation, we explore two distinct but conceptually related themes within the broad domain of topological and disordered condensed …
-
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 …
-
Quantum Transport and Electric-Field Effects in Layered Topological Semimetals and Magnetic Materials
… on quantum devices in layered Dirac nodal line topological semimetals and antiferromagnetic materials down to a few layers. We used gate-induced effects to alter the transport properties of these materials. </p> <p>First, we introduced current annealing in topological semimetals to achieve …
-
Patterns of electro-magnetic response in topological semi-metals
Topological semimetals are gapless states of matter which have robust and unique electromagnetic responses and surface states. In this thesis, we consider semimetals which have point like Fermi surfaces in various spatial dimensions $D=1,2,3$ which naturally occur in the transition between $n$th …
-
On the topological properties of the vibrations of solids
This thesis presents the study of the topological properties in the atomic vibrations in solids. The state-of-the-art quantum mechanical simulation techniques are presented first to accurately describe the band structures of electrons and vibrational spectra of nuclei for topological analysis. Two …
-
Higher-order topological phases with crystalline symmetries
Topological insulators (TIs) that are insulating in the bulk but conducting at surfaces have been thoroughly studied for decades. Recently, a new class of TIs, dubbed the higher-order topological insulator (HOTI), has been discovered. Unlike conventional TIs, it is gapped at the boundaries but host …
-
Quantum oscillations in Dirac semimetals
Dirac semimetals have recently gained interest due to their unique experimental signatures many of which can be explained by the topologically non-trivial band structure in these materials. Among the many candidates, the tellurides NbTe₄, TaPtTe₅ and TaNiTe₅ appear to provide a promising platform …
-
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. …
-
Spectroscopy of Topological Materials and their Technological Applications
Topological materials have been at the forefront of condensed matter physics and material science research in the past decade. The concept of topology has greatly shaped our modern understanding of matter including how band topology can tailor the exotic electronic and structural properties of a …
-
Engineering relativistic fermions in condensed matter systems
… predicted in doped inversion symmetric Weyl semimetals (WSM). Using a four terminal measurement configuration, we show that the nodal points may be shifted and induce a topological phase transition by an application of transverse uniform current in doped WSM. We analyze the topological phase …
-
Quantum oscillation studies in the unconventional superconductor YFe₂Ge₂ and in the Dirac semimetal candidates NbXSb (X = Ge/Si)
… surface sheets in both materials, suggesting a topological nature in these materials.
-
Electronic properties of topological semimetal candidates ACd$_2$Pn$_2$ (A = Eu, Sr; Pn = As, Sb)
Weyl semimetals have attracted significant attention due to their intriguing electronic properties arising from the presence of Weyl points. Among them, ideal magnetic Weyl semimetals, characterized by a single pair of Weyl points close to the Fermi level, have long been sought for exploring the …
-
Angle-resolved photoemission studies of thin-film topological materials
… examines the electronic properties of topological materials in their thin film forms, including a prototypical topological insulator (TI), Bi2Te3, and a newly discovered topological Dirac semimetal (TDS), α-Sn under suitable strain. TIs and TDSs have nontrivial surface states and unique …