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Visualizing Topological Phases in Interacting Quantum Materials
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  
Angle-resolved photoemission spectroscopy
키워드  
Strong interactions
키워드  
Topological materials
키워드  
Quantum responses
키워드  
Saddle points
기타저자  
Princeton University Physics
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
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■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.

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