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Two Case Studies on Quantum Many-Body Interactions by Angle-Resolved Photoemission Spectroscopy
Two Case Studies on Quantum Many-Body Interactions by Angle-Resolved Photoemission Spectroscopy
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104734
- ISBN
- 9798290651798
- DDC
- 530
- 저자명
- Li, Yingfei.
- 서명/저자
- Two Case Studies on Quantum Many-Body Interactions by Angle-Resolved Photoemission Spectroscopy
- 발행사항
- [Sl] : Stanford University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 128 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Shen, Zhi-Xun.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2025.
- 초록/해제
- 요약Understanding the eigenstates governed by the Hamiltonian, which incorporates multiple interactions among quantum particles, is a central theme in condensed matter physics. Angle-resolved photoemission spectroscopy (ARPES) provides a unique advantage in this pursuit, as it directly probes the single-particle removal spectral function. Here, we demonstrate the power of ARPES through two case studies.First, we investigate the topological band structure in the topological superconductor FeTe0.55Se0.45(FTS). Leveraging high-resolution measurement and matrix element effects, we identify three key components: the kz-independent surface state, the pzorbital component, and the band inversion. These findings bridge the gap between between experimentally observed band structure and theoretical predictions, highlighting the role of electron-electron correlations in modifying the band topology and reinforcing the case for a topological band structure in FTS.Second, we explore a novel mechanism towards colossal magnetoresistance in EuCd2P2. While the low-energy spectral weight tracks the resistivity anomaly, the spectra remain completely incoherent and strongly suppressed with no hint of a Landau quasiparticle. Through systematic material and temperature dependence investigation complemented by theory, we attribute this non-quasiparticle feature to the strong presence of entangled magnetic and lattice interactions, a characteristic facilitated by the p-fmixing. These observations converge to a picture where spin-polarized polarons scattering at the ferromagnetic domain boundaries drives the colossal magnetoresistance in EuCd2P2.Our findings underscore the crucial role of ARPES in uncovering emergent quantum phenomena and provide new insights into the interplay of topology, electron correlations, and magnetism in quantum materials.
- 일반주제명
- Phase transitions
- 일반주제명
- Physics
- 일반주제명
- Energy
- 일반주제명
- Electrons
- 일반주제명
- Spectrum analysis
- 일반주제명
- Geometry
- 일반주제명
- Electric fields
- 일반주제명
- Symmetry
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017358670
■00520260202104734
■006m o d
■007cr#unu||||||||
■020 ▼a9798290651798
■035 ▼a(MiAaPQ)AAI32149636
■035 ▼a(MiAaPQ)Stanforddg753gh5088
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aLi, Yingfei.
■24510▼aTwo Case Studies on Quantum Many-Body Interactions by Angle-Resolved Photoemission Spectroscopy
■260 ▼a[Sl]▼bStanford University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a128 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Shen, Zhi-Xun.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2025.
■520 ▼aUnderstanding the eigenstates governed by the Hamiltonian, which incorporates multiple interactions among quantum particles, is a central theme in condensed matter physics. Angle-resolved photoemission spectroscopy (ARPES) provides a unique advantage in this pursuit, as it directly probes the single-particle removal spectral function. Here, we demonstrate the power of ARPES through two case studies.First, we investigate the topological band structure in the topological superconductor FeTe0.55Se0.45(FTS). Leveraging high-resolution measurement and matrix element effects, we identify three key components: the kz-independent surface state, the pzorbital component, and the band inversion. These findings bridge the gap between between experimentally observed band structure and theoretical predictions, highlighting the role of electron-electron correlations in modifying the band topology and reinforcing the case for a topological band structure in FTS.Second, we explore a novel mechanism towards colossal magnetoresistance in EuCd2P2. While the low-energy spectral weight tracks the resistivity anomaly, the spectra remain completely incoherent and strongly suppressed with no hint of a Landau quasiparticle. Through systematic material and temperature dependence investigation complemented by theory, we attribute this non-quasiparticle feature to the strong presence of entangled magnetic and lattice interactions, a characteristic facilitated by the p-fmixing. These observations converge to a picture where spin-polarized polarons scattering at the ferromagnetic domain boundaries drives the colossal magnetoresistance in EuCd2P2.Our findings underscore the crucial role of ARPES in uncovering emergent quantum phenomena and provide new insights into the interplay of topology, electron correlations, and magnetism in quantum materials.
■590 ▼aSchool code: 0212.
■650 4▼aPhase transitions
■650 4▼aPhysics
■650 4▼aEnergy
■650 4▼aElectrons
■650 4▼aSpectrum analysis
■650 4▼aGeometry
■650 4▼aElectric fields
■650 4▼aAtoms & subatomic particles
■650 4▼aSymmetry
■690 ▼a0605
■690 ▼a0791
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358670▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


