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Emergent Quantum Order in the Strongly Coupled Moire-Hofstadter Regime
Emergent Quantum Order in the Strongly Coupled Moire-Hofstadter Regime
Emergent Quantum Order in the Strongly Coupled Moire-Hofstadter Regime

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105112
ISBN  
9798293893522
DDC  
530
저자명  
Divic, Stefan.
서명/저자  
Emergent Quantum Order in the Strongly Coupled Moire-Hofstadter Regime
발행사항  
[Sl] : University of California, Berkeley, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
193 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
주기사항  
Advisor: Zaletel, Michael P.
학위논문주기  
Thesis (Ph.D.)--University of California, Berkeley, 2025.
초록/해제  
요약A collection of many coordinated degrees of freedom can exhibit macroscopic behaviour bearing little resemblance to that of its constituent parts, a phenomenon known as emergence. In quantum materials, intricate correlations between electrons and ions produce a zoo of emergent behaviours that physicists seek to characterize and control. The past decade has seen rapid development in the synthesis and manipulation of moire heterostructures, a new family of highly-tunable materials consisting of layered 2D sheets of atoms. Under the application of a perpendicular magnetic field, these devices provide unprecedented access to the Hofstadter flux regime, in which the movement of electrons is sensitive to both cyclotron motion and the effective moire lattice, leading to quantized response and topological obstructions to wavefunction localization. In some moire systems with no applied field, pairs of low-energy electronic degrees of freedom behave as though subjected to opposite internal magnetic fields, permitting an effective Hofstadter description of these systems as well.This dissertation investigates the correlated behaviour of moire-Hofstadter electrons under the influence of strong repulsive interactions. In Chapter 2, we study a lattice model inspired by magic-angle twisted bilayer graphene where the tension between these localizing forces and the intrinsic delocalization of low-energy electronic states stabilizes a correlated topological insulator, with evidence that hole doping leads to unconventional superconductivity. In Chapter 3, we reveal and characterize a quantum phase transition between integer quantum Hall and chiral spin liquid phases in a Hofstadter-Hubbard model of moire transition metal dichalcogenides, exposing a hidden particle-hole symmetry and the structure of critical current fluctuations. Finally, Chapter 4 argues that the energetic properties of fractionalized excitations in the spin liquid phase near this quantum critical point are ideal for the microscopic realization of Laughlin's anyon superconductivity proposal.
일반주제명  
Condensed matter physics
일반주제명  
Physics
일반주제명  
Quantum physics
일반주제명  
Theoretical physics
키워드  
Quantum criticality
키워드  
Quantum Hall effects
키워드  
Spin liquids
키워드  
Strongly correlated electrons
키워드  
Superconductivity
키워드  
Topological order
기타저자  
University of California, Berkeley Physics
기본자료저록  
Dissertations Abstracts International. 87-04B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798293893522
■035    ▼a(MiAaPQ)AAI32237113
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aDivic,  Stefan.
■24510▼aEmergent  Quantum  Order  in  the  Strongly  Coupled  Moire-Hofstadter  Regime
■260    ▼a[Sl]▼bUniversity  of  California,  Berkeley▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a193  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-04,  Section:  B.
■500    ▼aAdvisor:  Zaletel,  Michael  P.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Berkeley,  2025.
■520    ▼aA  collection  of  many  coordinated  degrees  of  freedom  can  exhibit  macroscopic  behaviour  bearing  little  resemblance  to  that  of  its  constituent  parts,  a  phenomenon  known  as  emergence.  In  quantum  materials,  intricate  correlations  between  electrons  and  ions  produce  a  zoo  of  emergent  behaviours  that  physicists  seek  to  characterize  and  control.  The  past  decade  has  seen  rapid  development  in  the  synthesis  and  manipulation  of  moire  heterostructures,  a  new  family  of  highly-tunable  materials  consisting  of  layered  2D  sheets  of  atoms.  Under  the  application  of  a  perpendicular  magnetic  field,  these  devices  provide  unprecedented  access  to  the  Hofstadter  flux  regime,  in  which  the  movement  of  electrons  is  sensitive  to  both  cyclotron  motion  and  the  effective  moire  lattice,  leading  to  quantized  response  and  topological  obstructions  to  wavefunction  localization.  In  some  moire  systems  with  no  applied  field,  pairs  of  low-energy  electronic  degrees  of  freedom  behave  as  though  subjected  to  opposite  internal  magnetic  fields,  permitting  an  effective  Hofstadter  description  of  these  systems  as  well.This  dissertation  investigates  the  correlated  behaviour  of  moire-Hofstadter  electrons  under  the  influence  of  strong  repulsive  interactions.  In  Chapter  2,  we  study  a  lattice  model  inspired  by  magic-angle  twisted  bilayer  graphene  where  the  tension  between  these  localizing  forces  and  the  intrinsic  delocalization  of  low-energy  electronic  states  stabilizes  a  correlated  topological  insulator,  with  evidence  that  hole  doping  leads  to  unconventional  superconductivity.  In  Chapter  3,  we  reveal  and  characterize  a  quantum  phase  transition  between  integer  quantum  Hall  and  chiral  spin  liquid  phases  in  a  Hofstadter-Hubbard  model  of  moire  transition  metal  dichalcogenides,  exposing  a  hidden  particle-hole  symmetry  and  the  structure  of  critical  current  fluctuations.  Finally,  Chapter  4  argues  that  the  energetic  properties  of  fractionalized  excitations  in  the  spin  liquid  phase  near  this  quantum  critical  point  are  ideal  for  the  microscopic  realization  of  Laughlin's  anyon  superconductivity  proposal.
■590    ▼aSchool  code:  0028.
■650  4▼aCondensed  matter  physics
■650  4▼aPhysics
■650  4▼aQuantum  physics
■650  4▼aTheoretical  physics
■653    ▼aQuantum  criticality
■653    ▼aQuantum  Hall  effects
■653    ▼aSpin  liquids
■653    ▼aStrongly  correlated  electrons
■653    ▼aSuperconductivity
■653    ▼aTopological  order
■690    ▼a0611
■690    ▼a0605
■690    ▼a0599
■690    ▼a0753
■71020▼aUniversity  of  California,  Berkeley▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g87-04B.
■790    ▼a0028
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359385▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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