The interplay between magnetism and electronic structure in topological materials
In: Jiang_washington_0250E_25311.pdf;; (2023)
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Thesis (Ph.D.)--University of Washington, 2023 ; Over the past 40 years, topological materials have emerged as a fascinating new class of phases of matter, characterized by their robust fundamental properties that remain invariant under smooth changes of material parameters, capturing widespread interest and driving extensive research in the field. The more recent realization of magnetic topological materials has unlocked new research directions, as these materials display a remarkable interplay between magnetic order and topological electronic properties. This connection leads to various exotic phenomena and emergent quantum states, such as the quantum anomalous Hall effect, axion insulators, and magnetic Weyl semimetals. Moreover, these materials provide opportunities to study topological phase transitions with easily tunable magnetic fields, facilitating a deeper understanding of the underlying physics and paving the way for the exploration of novel phenomena rooted in unique topological properties. In the intrinsic antiferromagnetic topological insulator MnBi$_{2}$Te$_{4}$, various topological phases across different dimensions and types of magnetism provide a unique platform for studying the interplay between band topology and magnetic order. The ground state of bulk MnBi$_{2}$Te$_{4}$ is an antiferromagnetic topological insulator protected by the combined half-layer lattice translation and time-reversal symmetry ($S = \tau_{1/2}\mathcal{T}$). In the thin film limit, both quantum anomalous Hall insulator states and axion insulator states have been reported in odd and even septuple layers, respectively. In the bulk field-induced ferromagnetic state, MnBi$_{2}$Te$_{4}$ has been predicted to be an ideal type-II Weyl semimetal with a single pair of Weyl nodes. Moreover, due to the intertwined electronic structures and magnetic orders, it is possible to tune the type-II Weyl semimetal to a type-I Weyl semimetal across a Lifshitz transition by altering the magnetic field angle. Furthermore, the highly tunable ...
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The interplay between magnetism and electronic structure in topological materials
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Autor/in / Beteiligte Person: | Jiang, Qianni ; Chu, Jiun-Haw |
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Quelle: | Jiang_washington_0250E_25311.pdf;; (2023) |
Veröffentlichung: | 2023 |
Medientyp: | Hochschulschrift |
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