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 12 of 12 for “"Quantum anomalous hall effect"”.
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Interplay between Correlation and Topology in Two-dimensional Systems
… condensation, emergent Kondo lattice physics, quantum Hall ferromagnetism, (fractional) quantum anomalous Hall effect, and formation of anomalous Hall crystals. Typically in many of these systems, there is a nearly flat low-energy band with non-zero Berry curvature. This generalizes the …
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Aspects of Moiré Quantum Matter
The advent of moiré quantum matter has newly unified disparate themes in modern condensed matter physics, chief among them band theory, correlations, and topology. This thesis investigates how the interplay between these foundational elements leads to novel electronic phenomena uniquely enabled by …
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The Electronic Compressibility of Rhombohedral Graphene Multilayers
… by the recent discovery of the fractional quantum anomalous Hall effect in this system when the electrons are pushed away from the moiré interface by an external electric displacement field, we study the opposite moiré-proximal limit, in which the superlattice potential is considerably …
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Topological Phases in Perovskite Iridates with Strong Spin-Orbit Coupling
… model is constructed using the basis of an effective J eff=1/2 pseudo-spins. A topological magnetic insulator with quantum anomalous Hall effect is found in the bilayer superlattice when a magnetic order or magnetic field is present in the system. Lastly, a pair of helical Majorana fermions …
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Scanning tunneling microscopy studies of a tunable topological insulator and magnetic Weyl semimetal
… In Ge(Bix,Sb1-x)2Te4, increasing Sb substitution effectively electron dopes the sample and moves the Dirac point from 300 meV below the Fermi energy to energies above the Fermi energy while remaining topological. As the topological surface states in this material are well isolated from the bulk …
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Physics and applications of magnetic interactions in topological insulators
… that self-consistently solves frequency-domain quantum transport equations with the full solution of Maxwell's equations in three-dimensions. By simulating the radiation pattern of a quantum-confined monopole antenna using this methodology, we show that the field profile deviates from classical …
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First principles and machine learning methods in molecules, fluids, and solids
… developing an exact formalism for a quantum operator, investigating the origins of intriguing phenomena in solids using first principle methods, and heuristic data-driven machine learning to guide biomedical developments. The quantum Monte Carlo method is used to study molecules where …
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Investigation of magnetic interactions in topological insulators
… insulators towards the observation of new quantum states and for device applications. This thesis is a comprehensive study of magnetic interactions in topological insulators, from both experimental and theoretical perspective. Generically, there are two approaches to bring TI magnetic, the …
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Quantum transport in magnetic topological insulators
… 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 without the need of an external magnetic field. In addition to the potential of being used for low-dissipation power …
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Angle-resolved photoemission studies of topological thin films and superconducting heterostructures
… fascinating physical properties, including the quantum anomalous Hall effect, emergent phenomena such as Majorana fermions, supersymmetry, and skyrmions, and unconventional superconductivity. Many of these materials are thus highly suitable for applications in spintronics and fault-tolerant …
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The Interplay of Magnetism and Topology in Topological Insulators
… combination of topological protection with other effects, such as magnetism and superconductivity. In particular, the introduction of magnetism into TIs leads to a variety of unique phenomena and exotic quasiparticles not observed in conventional material systems, such as the quantum anomalous …
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Scanning tunneling microscopy and spectroscopy of topological materials with broken symmetry
… impurity states inside the gap that reduce the effective gap magnitude. Finally, Landau level spectroscopy was applied to the surface state of Pb1-xSnxSe where the signature of electron-phonon coupling was extracted from the surface state dispersion and was used to determine the mass enhancement …