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Visualizing Topological Phases in Interacting Quantum Materials
Visualizing Topological Phases in Interacting Quantum Materials
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103012
- ISBN
- 9798280746534
- DDC
- 530
- 저자명
- Cheng, Zijia.
- 서명/저자
- Visualizing Topological Phases in Interacting Quantum Materials
- 발행사항
- [Sl] : Princeton University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 184 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
- 주기사항
- Advisor: Hasan, M. Zahid.
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2025.
- 초록/해제
- 요약With the spontaneous organization of over 1023 interacting particles on a periodic lattice, quantum materials manifest emergent phases and phenomena that markedly diverge from those of their constituent few-particle systems. This complexity-dependent divergence was first articulated in Philip W. Anderson's seminal paper "More is Different", which underscores the critical importance of classifying and understanding emergent macroscopic phases of quantum matter-key objectives in contemporary condensed matter physics. Two major frameworks have emerged to describe these quantum many-body systems: interaction-induced phases, characterized by broken symmetries, and topological phases, which cannot be described by purely localized orbitals but involve collective states. While both approaches have seen significant progress in respective materials, their interplay within a single material system remains less explored. This thesis presents an experimental study of several interacting topological quantum materials, focusing on charge excitation spectra imaged via spin-angle-resolved photoemission spectroscopy (ARPES/Spin-ARPES) and related techniques, along with their transport responses.I first explore the three-dimensional electronic states of kagome materials AMn6Sn6 (A = Gd, Tb, Li) and ScV6Sn6. In these materials, transition metal ions form pristine kagome lattices that engender intriguing features such as Dirac crossings, flat bands, and saddle points. In AMn6Sn6, two distinct magnetic nodal lines inherent to the kagome lattice are directly imaged. Modifying the cation elements strongly alters the crossings of these nodal lines, revealing a field-direction-dependent spin-orbit gap and binding energy tunability. In ScV6Sn6, the complete bulk energy spectrum and its distinctive modulation by the charge density wave (CDW) are successfully uncovered with ARPES. The nontrivial Z2 topology of the CDW phase is demonstrated through bulk-surface correspondence via the detection of a robust spin-textured Dirac surface resonance in the broken symmetry phase.Next, I provide experimental evidence for two novel topological states driven by strong electron-electron interactions: a three-dimensional topological exciton insulator state in Ta2Pd3Te5 and a magnetic Kondo Weyl line state in CeCo2As2. In Ta2Pd3Te5, an excitonic insulator phase emerges at low temperatures, breaking mirror symmetries while exhibiting minimal structural distortion. Within this phase, a topological edge state protected by time-reversal symmetry is discovered. In CeCo2As2, the coexistence of ferromagnetism and Kondo screening at low temperatures appears to induce a mirror-symmetry-protected correlated nodal loop at the Fermi level, as observed in spectroscopic measurements, while significantly enhancing the anomalous Hall effect due to the concentrated Berry curvature observed via transport.The details of the experimental findings presented in this thesis demonstrate how interactions and topology give rise to novel and unprecedented electronic states, providing fertile platforms for further exploration of rich quantum responses driven by the synergistic interplay of strong correlation and quantum topology.
- 일반주제명
- Physics
- 일반주제명
- Applied physics
- 일반주제명
- Condensed matter physics
- 일반주제명
- Quantum physics
- 키워드
- Saddle points
- 기타저자
- Princeton University Physics
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103012
■006m o d
■007cr#unu||||||||
■020 ▼a9798280746534
■035 ▼a(MiAaPQ)AAI31842856
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aCheng, Zijia.
■24510▼aVisualizing Topological Phases in Interacting Quantum Materials
■260 ▼a[Sl]▼bPrinceton University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a184 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-12, Section: B.
■500 ▼aAdvisor: Hasan, M. Zahid.
■5021 ▼aThesis (Ph.D.)--Princeton University, 2025.
■520 ▼aWith the spontaneous organization of over 1023 interacting particles on a periodic lattice, quantum materials manifest emergent phases and phenomena that markedly diverge from those of their constituent few-particle systems. This complexity-dependent divergence was first articulated in Philip W. Anderson's seminal paper "More is Different", which underscores the critical importance of classifying and understanding emergent macroscopic phases of quantum matter-key objectives in contemporary condensed matter physics. Two major frameworks have emerged to describe these quantum many-body systems: interaction-induced phases, characterized by broken symmetries, and topological phases, which cannot be described by purely localized orbitals but involve collective states. While both approaches have seen significant progress in respective materials, their interplay within a single material system remains less explored. This thesis presents an experimental study of several interacting topological quantum materials, focusing on charge excitation spectra imaged via spin-angle-resolved photoemission spectroscopy (ARPES/Spin-ARPES) and related techniques, along with their transport responses.I first explore the three-dimensional electronic states of kagome materials AMn6Sn6 (A = Gd, Tb, Li) and ScV6Sn6. In these materials, transition metal ions form pristine kagome lattices that engender intriguing features such as Dirac crossings, flat bands, and saddle points. In AMn6Sn6, two distinct magnetic nodal lines inherent to the kagome lattice are directly imaged. Modifying the cation elements strongly alters the crossings of these nodal lines, revealing a field-direction-dependent spin-orbit gap and binding energy tunability. In ScV6Sn6, the complete bulk energy spectrum and its distinctive modulation by the charge density wave (CDW) are successfully uncovered with ARPES. The nontrivial Z2 topology of the CDW phase is demonstrated through bulk-surface correspondence via the detection of a robust spin-textured Dirac surface resonance in the broken symmetry phase.Next, I provide experimental evidence for two novel topological states driven by strong electron-electron interactions: a three-dimensional topological exciton insulator state in Ta2Pd3Te5 and a magnetic Kondo Weyl line state in CeCo2As2. In Ta2Pd3Te5, an excitonic insulator phase emerges at low temperatures, breaking mirror symmetries while exhibiting minimal structural distortion. Within this phase, a topological edge state protected by time-reversal symmetry is discovered. In CeCo2As2, the coexistence of ferromagnetism and Kondo screening at low temperatures appears to induce a mirror-symmetry-protected correlated nodal loop at the Fermi level, as observed in spectroscopic measurements, while significantly enhancing the anomalous Hall effect due to the concentrated Berry curvature observed via transport.The details of the experimental findings presented in this thesis demonstrate how interactions and topology give rise to novel and unprecedented electronic states, providing fertile platforms for further exploration of rich quantum responses driven by the synergistic interplay of strong correlation and quantum topology.
■590 ▼aSchool code: 0181.
■650 4▼aPhysics
■650 4▼aApplied physics
■650 4▼aCondensed matter physics
■650 4▼aQuantum physics
■653 ▼aAngle-resolved photoemission spectroscopy
■653 ▼aStrong interactions
■653 ▼aTopological materials
■653 ▼aQuantum responses
■653 ▼aSaddle points
■690 ▼a0605
■690 ▼a0599
■690 ▼a0215
■690 ▼a0611
■71020▼aPrinceton University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-12B.
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356663▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


