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Symmetry Indicators of Topological Bands- [electronic resource]
Symmetry Indicators of Topological Bands - [electronic resource]
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Symmetry Indicators of Topological Bands- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214101637
ISBN  
9798380416702
DDC  
530
저자명  
Fang, Yuan.
서명/저자  
Symmetry Indicators of Topological Bands - [electronic resource]
발행사항  
[S.l.]: : State University of New York at Stony Brook., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(172 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-04, Section: B.
주기사항  
Advisor: Cano, Jennifer.
학위논문주기  
Thesis (Ph.D.)--State University of New York at Stony Brook, 2023.
사용제한주기  
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초록/해제  
요약Symmetry indicators predict the topological phases of band structures from the band representations at high symmetry momenta. In previous literature, the symmetry indicators of stable topological insulators have been studied with the theory of topological quantum chemistry for all space groups. In this thesis, we aim to extend the topological quantum chemistry to produce symmetry indicators beyond those topological phases, including for bands with higher order topology and for bands in magnetic fields. First, the theory is extended to compute the centers of the Wannier functions. The Wannier centers are then used to determine the filling anomaly, which determines the corner states of higher order topology, as well as electronic polarization, quadrupole moment and higher multipole moments. Next, they are applied to classify the Dirac semimetals with higher order Fermi arcs. Our analysis shows that all linear Dirac points have higher order Fermi arcs terminating on their projections while quadratic Dirac points do not. This new classification answers the question, when do higher order Fermi arcs exist in Dirac semimetals? Then the theory is extended to systems in commensurate magnetic fields by introducing the magnetic symmetry operators, projective representations, and the additional gauge-invariant phases in the coset-decomposition. New symmetry indicators of Chern number in magnetic fields and new topological phases that only exist in magnetic fields are found using this approach. They are illustrated in a model in which a magnetic field drives a phase transition between an obstructed atomic limit and a trivial atomic limit. In the end, we apply the symmetry indicators to predict higher order topological insulators in a family of real materials called antiperovskites. 
일반주제명  
Condensed matter physics.
일반주제명  
Theoretical physics.
일반주제명  
Materials science.
일반주제명  
Physical chemistry.
일반주제명  
Quantum physics.
키워드  
Symmetry indicators
키워드  
Bands
키워드  
Topological insulators
키워드  
Topological quantum chemistry
키워드  
Dirac semimetals
키워드  
Antiperovskites
기타저자  
State University of New York at Stony Brook Physics
기본자료저록  
Dissertations Abstracts International. 85-04B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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