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Two-Dimensional Exciton Condensates in Two-Component Landau-Level or Flat-Chern-Band Systems
Two-Dimensional Exciton Condensates in Two-Component Landau-Level or Flat-Chern-Band Systems
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091545.5
- ISBN
- 9798270232634
- DDC
- 514
- 저자명
- Zou, Bo
- 서명/저자
- Two-Dimensional Exciton Condensates in Two-Component Landau-Level or Flat-Chern-Band Systems / Bo Zou
- 발행사항
- [Sl] : The University of Texas at Austin, 2025
- 형태사항
- 1 electronic resource (109 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisors: MacDonald, Allan H. Committee members: Shi, Li; Tutuc, Emanuel; Ippoliti, Matteo.
- 학위논문주기
- - Ph.D. : The University of Texas at Austin, 2025.
- 초록/해제
- 요약Recent progress of experimental techniques has advanced the fabrication of diverse two-dimensional materials and unlocked a new frontier for exploring quantum many-body physics. Many of these new systems manifest flat bands with nontrivial Chern numbers from Landau levels in magnetic fields to multilayer graphene or semi-conductor moirés. The suppressed kinetic energy promotes the correlation effects, making them ideal platforms for revealing novel phases where strong interactions and topology are intrinsically intertwinedThis dissertation investigates two specific systems with two components and and reveals exciton condensation as a unifying phenomenon in these systems. The first subject is the semiconductor bilayer where electrons and holes are doped into different layers separated by an insulating spacer. The strong Coulomb interaction pairs these carriers into interlayer excitons, which condense at low temperatures into superfluids. Under unbalanced doping of electrons and holes, vortices of the exciton superfluid emerge as the topological defects and host a fractionalized amount of electric charge. The second subject is the moirés homobilayers of transition metal dichalcogenides that form topological insulators with opposite Chern numbers for flat bands in the K and K' valleys. These flat bands are very similar to Landau levels due to the adiabatic approximation. In the intervalley coherent phases, which can also be viewed as the intervalley exciton condensates, the difference in Chern numbers induces winding of the phase of coherence. This complicates the phase diagram, leading to a rich competition between valley coherent and polarized phases that is absent in traditional valley or spin anisotropic systems with trivial topology.
- 언어주기
- English
- 일반주제명
- Applied mathematics
- 일반주제명
- Physics
- 일반주제명
- Theoretical physics
- 키워드
- Landau levels
- 키워드
- Flat bands
- 키워드
- Chern numbers
- 기타저자
- The University of Texas at Austin Physics
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260311091545.5
■006m o d
■007cr|nu||||||||
■020 ▼a9798270232634
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a514
■1001 ▼aZou, Bo▼eauthor.
■24510▼aTwo-Dimensional Exciton Condensates in Two-Component Landau-Level or Flat-Chern-Band Systems ▼cBo Zou
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (109 pages)
■336 ▼atext▼btxt▼2rdacontent
■337 ▼acomputer▼bc▼2rdamedia
■338 ▼aonline resource▼bcr▼2rdacarrier
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisors: MacDonald, Allan H. Committee members: Shi, Li; Tutuc, Emanuel; Ippoliti, Matteo.
■5021 ▼bPh.D.▼cThe University of Texas at Austin▼d2025.
■520 ▼aRecent progress of experimental techniques has advanced the fabrication of diverse two-dimensional materials and unlocked a new frontier for exploring quantum many-body physics. Many of these new systems manifest flat bands with nontrivial Chern numbers from Landau levels in magnetic fields to multilayer graphene or semi-conductor moirés. The suppressed kinetic energy promotes the correlation effects, making them ideal platforms for revealing novel phases where strong interactions and topology are intrinsically intertwinedThis dissertation investigates two specific systems with two components and and reveals exciton condensation as a unifying phenomenon in these systems. The first subject is the semiconductor bilayer where electrons and holes are doped into different layers separated by an insulating spacer. The strong Coulomb interaction pairs these carriers into interlayer excitons, which condense at low temperatures into superfluids. Under unbalanced doping of electrons and holes, vortices of the exciton superfluid emerge as the topological defects and host a fractionalized amount of electric charge. The second subject is the moirés homobilayers of transition metal dichalcogenides that form topological insulators with opposite Chern numbers for flat bands in the K and K' valleys. These flat bands are very similar to Landau levels due to the adiabatic approximation. In the intervalley coherent phases, which can also be viewed as the intervalley exciton condensates, the difference in Chern numbers induces winding of the phase of coherence. This complicates the phase diagram, leading to a rich competition between valley coherent and polarized phases that is absent in traditional valley or spin anisotropic systems with trivial topology.
■546 ▼aEnglish
■590 ▼aSchool code: 0227
■650 4▼aApplied mathematics
■650 4▼aPhysics
■650 4▼aTheoretical physics
■653 ▼aExciton condensation
■653 ▼aLandau levels
■653 ▼aFlat bands
■653 ▼aChern numbers
■7102 ▼aThe University of Texas at Austin▼bPhysics.▼edegree granting institution.
■7201 ▼aMacDonald, Allan H.▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361228▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
