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Thermodynamics of Interacting Electrons in Two-Dimensional Semiconductor Homostructures
Thermodynamics of Interacting Electrons in Two-Dimensional Semiconductor Homostructures
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104737
- ISBN
- 9798290652771
- DDC
- 530
- 서명/저자
- Thermodynamics of Interacting Electrons in Two-Dimensional Semiconductor Homostructures
- 발행사항
- [Sl] : Stanford University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 202 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Feldman, Ben.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2025.
- 초록/해제
- 요약Semiconductor moire materials, in which atomically-thin, two-dimensional sheets of semi-conductors are twisted and stacked together, have emerged as an ideal platform to study the interplay of magnetism, topology, and electronic correlations. Semiconductor homostruc-tures, where the moire interface is composed of the same atomic components, are a partic-ularly tunable subset of these materials by enabling long moire wavelengths and relatively stronger electronic interactions at low twist angles. Due to challenges of angular disorder in these systems, they have been difficult to examine using measurements that average spatially over devices. In this thesis, I will describe a set of experiments using scanning single electron transistor (SET) microscopy to explore the resulting thermodynamic ground states and charged excitations of interacting carriers in these systems with 100 nm spatial resolution.First, I motivate scanning SET as a well-suited probe of these twisted semiconductors. Then, I describe measurements via scanning SET on the the effects of interactions on the integer quantum Hall limit in monolayer WSe₂, a transition metal dichalcogenide (TMD) semiconductor that will form the basic building block of the rest of the devices studied in this thesis. Moving to twisted bilayer WSe2(tWSe₂), I present findings of multiple Chern insulating states at zero magnetic field, providing the first evidence of topological electronic bands in these systems. We are also able to control these topological phases by driving a topological-to-trivial phase transition as a function of a locally applied electric field using the SET tip. I also examine the thermodynamics of tWSe2, in a large magnetic field, in which the combination of a large Zeeman energy and Hofstadter's butterfly physics leads to a cascade of magnetic phase transitions. These transitions shed light on the spin-resolved Hofstadter spectrum and can help to disentangle the role of material and moire effects on the nature of the correlated ground states.Beyond tWSe2, I show data on twisted double bilayers (tdWSe2) and twisted mono-tetralayer (t1+4WSe2) WSe2, in which the thicker structures favor valence moire bands localized at the F-valley, rather than the K-valley bands stabilized in tWSe2. In tdWSe2. I present evidence for nontrivial spin excitations driven by kinetic magnetism, as well as competition between states at the - and K-valleys. Finally, I discuss ongoing efforts to combine tunable displacement fields with scanning SET by measuring a tWSe₂ device fabricated with a monolayer graphene top gate, enabling measurements of the correlated insulating gaps in that system as a function of displacement field.
- 일반주제명
- Phase transitions
- 일반주제명
- Motivation
- 일반주제명
- Physics
- 일반주제명
- Electrons
- 일반주제명
- Magnetic fields
- 일반주제명
- Electric fields
- 일반주제명
- Volleyball
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202104737
■006m o d
■007cr#unu||||||||
■020 ▼a9798290652771
■035 ▼a(MiAaPQ)AAI32149661
■035 ▼a(MiAaPQ)Stanfordhd928np3361
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aFoutty, Benjamin Aaron.
■24510▼aThermodynamics of Interacting Electrons in Two-Dimensional Semiconductor Homostructures
■260 ▼a[Sl]▼bStanford University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a202 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Feldman, Ben.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2025.
■520 ▼aSemiconductor moire materials, in which atomically-thin, two-dimensional sheets of semi-conductors are twisted and stacked together, have emerged as an ideal platform to study the interplay of magnetism, topology, and electronic correlations. Semiconductor homostruc-tures, where the moire interface is composed of the same atomic components, are a partic-ularly tunable subset of these materials by enabling long moire wavelengths and relatively stronger electronic interactions at low twist angles. Due to challenges of angular disorder in these systems, they have been difficult to examine using measurements that average spatially over devices. In this thesis, I will describe a set of experiments using scanning single electron transistor (SET) microscopy to explore the resulting thermodynamic ground states and charged excitations of interacting carriers in these systems with 100 nm spatial resolution.First, I motivate scanning SET as a well-suited probe of these twisted semiconductors. Then, I describe measurements via scanning SET on the the effects of interactions on the integer quantum Hall limit in monolayer WSe₂, a transition metal dichalcogenide (TMD) semiconductor that will form the basic building block of the rest of the devices studied in this thesis. Moving to twisted bilayer WSe2(tWSe₂), I present findings of multiple Chern insulating states at zero magnetic field, providing the first evidence of topological electronic bands in these systems. We are also able to control these topological phases by driving a topological-to-trivial phase transition as a function of a locally applied electric field using the SET tip. I also examine the thermodynamics of tWSe2, in a large magnetic field, in which the combination of a large Zeeman energy and Hofstadter's butterfly physics leads to a cascade of magnetic phase transitions. These transitions shed light on the spin-resolved Hofstadter spectrum and can help to disentangle the role of material and moire effects on the nature of the correlated ground states.Beyond tWSe2, I show data on twisted double bilayers (tdWSe2) and twisted mono-tetralayer (t1+4WSe2) WSe2, in which the thicker structures favor valence moire bands localized at the F-valley, rather than the K-valley bands stabilized in tWSe2. In tdWSe2. I present evidence for nontrivial spin excitations driven by kinetic magnetism, as well as competition between states at the - and K-valleys. Finally, I discuss ongoing efforts to combine tunable displacement fields with scanning SET by measuring a tWSe₂ device fabricated with a monolayer graphene top gate, enabling measurements of the correlated insulating gaps in that system as a function of displacement field.
■590 ▼aSchool code: 0212.
■650 4▼aPhase transitions
■650 4▼aMotivation
■650 4▼aPhysics
■650 4▼aElectrons
■650 4▼aMagnetic fields
■650 4▼aElectric fields
■650 4▼aVolleyball
■690 ▼a0605
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358685▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
