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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 Spectro...
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  
Atoms & subatomic particles
일반주제명  
Symmetry
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
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MARC

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■006m          o    d                
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■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.

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