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Transport Experiments on Topological and Strongly Correlated Conductors
Transport Experiments on Topological and Strongly Correlated Conductors
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211150928
- ISBN
- 9798382191300
- DDC
- 530
- 서명/저자
- Transport Experiments on Topological and Strongly Correlated Conductors
- 발행사항
- [Sl] : Princeton University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 206 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
- 주기사항
- Advisor: Ong, Nai Phuan .
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2024.
- 초록/해제
- 요약Band theory categorizes materials based of the presence or lack of an energy gap in the electronic density of states at the Fermi level: metal, insulator, or semiconductor. However, in topological and strongly correlated phases of matter, this simple classification breaks down.In topological materials, Berry curvature (even in bands far-removed from the Fermi level) gives rise to conducting surface and edge states. This thesis studies two topological conductors. The first is the Weyl semimetal Co2MnGa in which we discover an unexpected resistance anisotropy that twists by 90◦ between the upper and lower surfaces of thin lamellar crystals. We show that this twisted anisotropy arises from distinct surface states that are prevented from hybridizing with gapless states in the bulk. The second system is the original topological insulating state: the quantum Hall state. We develop high-mobility two-dimensional electron gases based on graphene that exhibit both the integer and fractional quantum Hall effects in strong magnetic fields at cryogenic temperatures. We engineer a quantum point contact in these devices and demonstrate that it can selectively control the transmission of the dissipationless quantum Hall edge modes, reaching full pinch-off. We also describe the development of a sensitive system to measure noise (Johnson and shot) in these devices. This system can be used to study properties of interesting quantum phases that are inaccessible to standard resistive transport techniques.In addition to the fractional quantum Hall effect in graphene, we study another strongly correlated system: unconventional type-II superconductivity in infinite-layer nickelates. We probe vortices in the superconducting order parameter through measurements of the off-diagonal component of the thermoelectric response tensor (Nernst effect) in strong magnetic fields. We provide the first evidence that these nickelates have a robust vortex-liquid phase, which we show has strong similarities to that of the high-Tc cuprates.
- 일반주제명
- Physics
- 일반주제명
- Materials science
- 일반주제명
- Electromagnetics
- 키워드
- Graphene
- 키워드
- Shot noise
- 키워드
- Weyl semimetals
- 기타저자
- Princeton University Physics
- 기본자료저록
- Dissertations Abstracts International. 85-10B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211150928
■006m o d
■007cr#unu||||||||
■020 ▼a9798382191300
■035 ▼a(MiAaPQ)AAI30989796
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aQuirk, Nicholas Patrick.
■24510▼aTransport Experiments on Topological and Strongly Correlated Conductors
■260 ▼a[Sl]▼bPrinceton University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a206 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-10, Section: B.
■500 ▼aAdvisor: Ong, Nai Phuan .
■5021 ▼aThesis (Ph.D.)--Princeton University, 2024.
■520 ▼aBand theory categorizes materials based of the presence or lack of an energy gap in the electronic density of states at the Fermi level: metal, insulator, or semiconductor. However, in topological and strongly correlated phases of matter, this simple classification breaks down.In topological materials, Berry curvature (even in bands far-removed from the Fermi level) gives rise to conducting surface and edge states. This thesis studies two topological conductors. The first is the Weyl semimetal Co2MnGa in which we discover an unexpected resistance anisotropy that twists by 90◦ between the upper and lower surfaces of thin lamellar crystals. We show that this twisted anisotropy arises from distinct surface states that are prevented from hybridizing with gapless states in the bulk. The second system is the original topological insulating state: the quantum Hall state. We develop high-mobility two-dimensional electron gases based on graphene that exhibit both the integer and fractional quantum Hall effects in strong magnetic fields at cryogenic temperatures. We engineer a quantum point contact in these devices and demonstrate that it can selectively control the transmission of the dissipationless quantum Hall edge modes, reaching full pinch-off. We also describe the development of a sensitive system to measure noise (Johnson and shot) in these devices. This system can be used to study properties of interesting quantum phases that are inaccessible to standard resistive transport techniques.In addition to the fractional quantum Hall effect in graphene, we study another strongly correlated system: unconventional type-II superconductivity in infinite-layer nickelates. We probe vortices in the superconducting order parameter through measurements of the off-diagonal component of the thermoelectric response tensor (Nernst effect) in strong magnetic fields. We provide the first evidence that these nickelates have a robust vortex-liquid phase, which we show has strong similarities to that of the high-Tc cuprates.
■590 ▼aSchool code: 0181.
■650 4▼aPhysics
■650 4▼aMaterials science
■650 4▼aElectromagnetics
■653 ▼aGraphene
■653 ▼aShot noise
■653 ▼aStrongly correlated system
■653 ▼aSuperconductivity
■653 ▼aTopological materials
■653 ▼aWeyl semimetals
■690 ▼a0605
■690 ▼a0794
■690 ▼a0607
■71020▼aPrinceton University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g85-10B.
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160183▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
