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Dissertations / Theses on the topic 'Topological Quantum Materials'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Timothy, H. Hsieh Timothy (Timothy Hwa-wei). "Topological materials and quantum entanglement." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/103228.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 83-91).<br>As the title implies, this thesis consists of two main topics: materials which realize topological phases of matter and applications of the concept of entanglement in understanding topological phases and their transitions. The first part will focus on a particular class of materials called topological crystalline insulators (TCI), which are bulk insulators with metallic boundary states protected by crystal mirror s

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2

Schönherr, Piet. "Growth and characterisation of quantum materials nanostructures." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:7dca792e-4236-4d19-aa59-7c9c3cb5d0e4.

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The three key areas of this thesis are crystal synthesis strategies, growth mechanisms, and new types of quantum materials nanowires. The highlights are introduction of a new catalyst (TiO2) for nanowire growth and application to Bi2Se3, Bi2Te3, SnO2, and Ge nanowires; demonstration of step-flow growth, a new growth mechanism, for Bi2Te3 sub-micron belts; and the characterisation of the first quasi-one dimensional topological insulator (orthorhombic Sb-doped Bi2Se3) and topological Dirac semimetal nanowires (Cd3As2). Research into new materials has been one of the driving forces that have cont

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3

Chono, Hiroomi. "Nonequilibrium quantum phenomena and topological superconductivity in atomic layer materials." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263449.

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4

Radha, Santosh Kumar. "Knitting quantum knots-Topological phase transitions in Two-Dimensional systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1595870012750826.

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5

Tenasini, Giulia. "Quantum transport in monolayer WTe2." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14897/.

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Il ditellurio di tungsteno (WTe2) appartiene alla classe dei dicalcogenuri di metalli di transizione (TMDs), che rappresentano attualmente i materiali più promettenti, insieme al grafene, nel campo di ricerca dei cristalli bidimensionali (2D). Grazie ad una caratteristica struttura stratificata, con differenti piani atomici legati da forze di van der Waals, mediante esfoliazione è possibile isolare strati di spessore quasi-atomico di TMDs, detti “monostrati”, con proprietà spesso molto diverse dal materiale bulk originario. Il WTe2 nella sua forma a monostrato, è stato recentemente oggett

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6

Yang, Hung-Yu. "Novel Electromagnetic Responses in Topological Semimetals: Case Studies of Rare-Earth Monopnictides and RAlX Material Family." Thesis, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109188.

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Thesis advisor: Fazel Tafti<br>Since the idea of topology was realized in real materials, the hunt is on for new candidates of topological semimetals with novel electromagnetic responses. For example, topological states can be highly conductive due to a topological protection, which can be destroyed in a magnetic field and lead to an extremely high magnetoresistance. In Weyl semimetals, a transverse current that would usually require a magnetic field to emerge, can be generated by intrinsic Berry curvature without a magnetic field -- the celebrated anomalous Hall effect. In this dissertation,

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7

Riha, Christian. "Quantum transport investigations of low-dimensional electron gases in AlxGa1-xAs/GaAs- and Bi2Se3-based materials." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20352.

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Die Transporteigenschaften eines Elektronengases mit reduzierter Dimensionalität werden von den Welleneigenschaften der Elektronen bestimmt. Dies ermöglicht es, verschiedene Quanteneffekte, wie Quanteninterferenz, zu beobachten. Im ersten Teil dieser Arbeit werden geätzte Quantenringe und eindimensionale (1D) Verengungen, basierend auf AlxGa1-xAs/GaAs-Heterostrukturen, hinsichtlich ihrer Transporteigenschaften untersucht. Messungen des thermischen Rauschens im Gleichgewichtszustand zeigen, dass der Erwartungswert mit den Rauschspektren aller 1D Verengungen übereinstimmt, jedoch um bis z

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8

Pournia, Seyyedesadaf. "Exploring the Photoresponse and Optical Selection Rules in the Semiconductor Nanowires, Topological Quantum Materials and Ferromagnetic Semiconductor Nanoflakes using Polarized Photocurrent Spectroscopy." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627666632280473.

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9

Wissmann, Michael. "Transport quantique dans les isolants topologiques magnétiques intrinsèques." Electronic Thesis or Diss., Université Grenoble Alpes, 2025. http://www.theses.fr/2025GRALY016.

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La nouvelle famille d'isolants topologiques stratifiés van-der-Waals intrinsèquement magnétiques (iMTI) Mn(Bi,Sb)2Te4 avec un fort couplage spin-orbite présente un grand intérêt pour l'étude de l'interaction entre la topologie et l'ordre magnétique dans les structures de bandes électroniques. Il a fait l'objet d'une attention croissante en tant que plateforme potentielle pour étudier les phases topologiques exotiques, telles que les états de Hall quantique anormal (QAH) ou d'isolant d'Axion, accordés par le magnétisme. L'état d'isolant QAH est caractérisé par un état de bord unidimensionnel sa

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10

Rousseau, Simon. "Propriétés de transport anormales dans le composé skyrmionique EuPtSi." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALY096.

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Dans cette thèse, j’ai étudié les propriétés de transport électrique et thermique du composé non centro-symétrique EuPtSi, à basse température et fort champ magnétique.La première partie des résultats porte sur l’étude à bas champ (H < 5 T) des phases magnétiques observées dans EuPtSi en dessous de la température de Néel T = 4.1 K, pour les trois directions principales: H ∥ [110], H ∥ [111] et H ∥ [100]. Grâce à la dépendance angulaire de la résistivité sous champ, j’ai confirmé la présence de phases exotiques: la phase A skyrmionique pour H ∥ [111], et les phases A’ et B supposées skyrmion

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11

Heath, Joshuah. "Novel metallic behavior in topologically non-trivial, quantum critical, and low-dimensional matter:." Thesis, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109180.

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Thesis advisor: Kevin S. Bedell<br>We present several results based upon non-trivial extensions of Landau-Fermi liquid theory. First proposed in the mid-20th century, the Fermi liquid approach assumes an adiabatic “switching-on” of the interaction, which allows one to describe the collective excitations of the many-body system in terms of weakly-interacting quasiparticles and quasiholes. At its core, Landau-Fermi liquid theory is often considered a perturbative approach to study the equilibrium thermodynamics and out-of-equilibrium response of weakly-correlated itinerant fermions, and therefor

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12

Szewczyk, Adam. "Supercurrents in a Topological Josephson Junction with a Magnetic Quantum Dot." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-79327.

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The purpose of this master thesis is to investigate theoretically the influence of a nanomagnet on the Josephson effect displayed by phase biased point contacts consisting of topological superconductors. The device is modeled using the nonequilibrium Keldysh Green’s function technique. First, the Gor’kov Green’s functions are calculated. From these Green’s functions, the quasi-classical ones, relevant for energies around the Fermi energy, are obtained. Transport properties such as charge currents are calculated and analyzed in terms of the junction’s density of states displaying Andreev and Ma

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13

Eriksson, Hjalmar. "From the quantum Hall effect to topological insulators : A theoretical overview of recent fundamental developments in condensed matter physics." Thesis, Uppsala University, Theoretical Physics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-126860.

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<p>In this overview I describe the simplest models for the quantum Hall and quantum spin Hall effects, and give some general indications as to the description of topological insulators. As a background to the theoretical models I will first trace the development leading up to the description of topological insulators . Then I will present Laughlin's original model for the quantum Hall effect and briefly discuss its limitations. After that I will describe the Kane and Mele model for the quantum spin Hall effect in graphene and discuss its relation to a general quantum spin Hall system. I will c

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14

Spodyneiko, Lev. "Topological Invariants of Interacting Gapped Quantum Materials and Transport Phenomena." Thesis, 2021. https://thesis.library.caltech.edu/14214/3/Caltech_Thesis%20%289%29.pdf.

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<p>In this thesis we study transport properties of interacting lattice system focusing, on those which become topologically protected at low temperatures for gapped Hamiltonians. We prove the vanishing of the net energy currents in equilibrium states of lattice systems as well as systems of nonrelativistic particles with finite-range potential interactions. We derive Kubo-like formulas for the thermal and thermoelectic Hall conductances of arbitrary 2d lattice systems which are free from ambiguities associated with the definition of magnetizations. We use these formulas to define a relativ

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15

(9721421), Todd F. Van Mechelen. "Foundations of topological electrodynamics." Thesis, 2020.

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<div>Over the last decade, Dirac matter has become one of the most prominent fields of research in contemporary material science due to the incredibly rich physics of the Dirac equation. Notable examples are the Dirac cones in graphene, Weyl points in TaAs, and gapless edge states in Bi<sub>2</sub>Te<sub>3</sub>. These unique phases of matter are intimately related to the topological structure of Dirac fermions. However, it remains an open question if the topological structure of Maxwell's equations predicts yet new phases of matter. This thesis will conclusively answer this question.</div><di

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16

TOMARCHIO, LUCA. "Terahertz and optical response of novel quantum materials." Doctoral thesis, 2023. https://hdl.handle.net/11573/1667139.

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Quantum materials are a class of systems that host low energy emergent properties due to the strong correlations between the lattice, charge, spin and orbital degrees of freedom. In recent years, this classification has encompassed the world of strongly correlated materials, like high-temperature superconductors and Mott-Hubbard insulators, and the topological states of matter, like Dirac/Weyl semimetals and topological insulators. This doctoral thesis discusses the study of the optical characterization of novel quantum materials, with a special focus on the terahertz (THz) spectral range, whe

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17

Van, Truong Tran, and 陳文長. "EFFECTS OF ELECTRIC-GATING ON THE EDGE-STATES AND QUANTUM TRANSPORT IN 2D TOPOLOGICAL MATERIALS (HgTe)." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/18324741609372183958.

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碩士<br>國立交通大學<br>電子物理系所<br>100<br>This work covers three parts: the topological features of the HgTe/CdTe quantum well, the electronic spectrum of quantum Hall bar with or without a split-gated configuration, and the quantum transport through a quantum point contact formed by a finite-length split-gate on a HgTe/CdTe quantum Hall bar. In the first part, we work out and demonstrate the Z2 topological invariant of HgTe/CdTe system. In the second part, we show that the edge states, when exist, will remain locating to the vicinity of the boundaries of the quantum spin Hall bar and not to the bounda

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18

Chang, Jiwon active 2013. "Ab-initio electronic structure and quantum transport calculations on quasi-two-dimensional materials for beyond Si-CMOS devices." 2013. http://hdl.handle.net/2152/21742.

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Atomically two-dimensional (2-D) graphene, as well as the hexagonal boron nitride dielectric have been and are continuing to be widely investigated for the next generation nanoelectronic devices. More recently, other 2-D materials and electronic systems including the surface states of topological insulators (TIs) and monolayers of transition metal dichalcogenides (TMDs) have also attracted considerable interest. In this work I have focused on these latter two material systems on possible device applications. TIs are characterized by an insulating bulk band gap and metallic Dirac surface states

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19

Bhattacharyya, Semonti. "A Study of Electrical Transport and 1 / f Noise in Topological Insulators." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2887.

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The recent discoveries of topological insulators (TI) has opened a new realm for study¬ing topological systems and exploring the exotic properties they offer. The in-built topological protection against direct backscattering and absence of localization makes two-dimensional (2D) surface states of bismuth chalcogenide-based strong TI a promising platform for studying interesting phenomena in condensed matter physics like dissipation-less transport, quantum anomalous hall effect, topological magnetoelectric effect, majo¬rana fermions etc. and also makes this system very suitable for applications

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20

Bhattacharyya, Semonti. "A Study of Electrical Transport and 1 / f Noise in Topological Insulators." Thesis, 2016. http://hdl.handle.net/2005/2887.

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The recent discoveries of topological insulators (TI) has opened a new realm for study¬ing topological systems and exploring the exotic properties they offer. The in-built topological protection against direct backscattering and absence of localization makes two-dimensional (2D) surface states of bismuth chalcogenide-based strong TI a promising platform for studying interesting phenomena in condensed matter physics like dissipation-less transport, quantum anomalous hall effect, topological magnetoelectric effect, majo¬rana fermions etc. and also makes this system very suitable for applications

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21

Wang, Zhuo. "Magneto-transport Study of 3D Topological Insulator Bi2Te3 And GaAs/AlGaAs 2D Electron System." 2017. http://scholarworks.gsu.edu/phy_astr_diss/96.

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Magneto-transport study on high mobility electron systems in both 2D- and 3D- case has attracted intense attention in past decades. This thesis focuses on the magnetoresistance behavior in 3D topological insulator Bi2Te3 and GaAs/AlGaAs 2D electron system at low magnetic field range 0.4T the first drop at T~3.4K to tndium superconductor and considered the second drop at lower temperature as the proximity effect that occurred near the interface between these two materials. On the other hand, GaAs/AlGaAs heterostructure, as a III-V semiconductor family, has been extensively studied for exploring

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22

Dal, Lago Virginia. "Dirección y manipulación de estados topológicos de la materia. Efectos en grafeno y otros materiales de baja dimensión." Bachelor's thesis, 2017. http://hdl.handle.net/11086/5979.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2017.<br>Los descubrimientos experimentales del grafeno y de los materiales aislantes topológicos han suscitado un gran interés en la comunidad científica. El objetivo de la presente tesis es estudiar los estados topológicos de borde del grafeno y otros materiales de baja dimensión, y analizar diferentes formas de manipulación y dirección de los mismos para obtener sistemas con nuevas propiedades. Para ello, empleamos como base el modelo SSH para polímeros conductores (presenta

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