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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
- Spin liquids
- 기타저자
- University of California, Berkeley Physics
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105112
■006m o d
■007cr#unu||||||||
■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.


