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Strongly Correlated Quantum States in Monolayer WTe2 and Its Moire Structures
Strongly Correlated Quantum States in Monolayer WTe2 and Its Moire Structures
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152935
- ISBN
- 9798346759935
- DDC
- 530
- 저자명
- Yu, Guo.
- 서명/저자
- Strongly Correlated Quantum States in Monolayer WTe2 and Its Moire Structures
- 발행사항
- [Sl] : Princeton University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 149 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
- 주기사항
- Advisor: Wu, Sanfeng.
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2024.
- 초록/해제
- 요약Landau's Fermi Liquid theory states that the low energy excitations in many-electron systems subject to Coulomb interaction in solid materials may be approximately described as noninteracting quasiparticles. It is very successful and works well for most crystals. However, in systems with strong correlations, behavior of charge carriers may disobey Fermi Liquid theory. Strongly-correlated systems can host many intriguing phenomena, including cases where electrons are effectively 'fractionalized' into parts. Their study is however challenging, due to the rareness of both material systems and detection probes. 2D materials have recently become a new material platform to search for strongly-correlated phenomena with their flexibility, versality and high device quality. Among various 2D materials, WTe2 has a special anisotropic lattice structure and hosts strong correlation, topology and spin-orbit coupling simultaneously. In this thesis, I presented several experimental studies related to the strongly-correlated phenomena in monolayer WTe2 and its moire structures.First, I present our discovery of a new quantum state, i.e. a 2D anisotropic Luttinger Liquid state in small angle twisted bilayer WTe2 (tWTe2). Its characteristics include an exceptionally high transport anisotropy, a power-law scaling behavior characteristic for Luttinger Liquid physics along the hard direction, and a non-linear differential resistance along the easy direction. Our results provide direct experimental evidence for 2D Luttinger liquid physics at ultralow temperatures, whose stability was a question under debate in theory. It opens up new possibilities to study non-Fermi liquid phenomena in a new regime. Second, novel excitations are observed in the insulating state of monolayer WTe2. Undoped mono-layer WTe2 is a quantum spin Hall insulator, but the insulating bulk state is beyond a simple band picture. I present evidence for the insulating WTe2 to be an excitonic insulator. More surprisingly, quantum oscillations mimicking the characteristic Shubnikov-de Haas (SdH) oscillations in metals are observed in the insulating state of monolayer WTe2. We discuss possible explanations and a comprehensive understanding of such states is important to the search for a class of new quantum matter such as neutral Fermi surface state in insulators.
- 일반주제명
- Condensed matter physics
- 일반주제명
- Physics
- 일반주제명
- Quantum physics
- 키워드
- 2D anisotropic
- 키워드
- Low energy
- 키워드
- Quantum states
- 기타저자
- Princeton University Electrical and Computer Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798346759935
■035 ▼a(MiAaPQ)AAI31563323
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aYu, Guo.▼0(orcid)0000-0003-1812-9825
■24510▼aStrongly Correlated Quantum States in Monolayer WTe2 and Its Moire Structures
■260 ▼a[Sl]▼bPrinceton University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a149 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-06, Section: B.
■500 ▼aAdvisor: Wu, Sanfeng.
■5021 ▼aThesis (Ph.D.)--Princeton University, 2024.
■520 ▼aLandau's Fermi Liquid theory states that the low energy excitations in many-electron systems subject to Coulomb interaction in solid materials may be approximately described as noninteracting quasiparticles. It is very successful and works well for most crystals. However, in systems with strong correlations, behavior of charge carriers may disobey Fermi Liquid theory. Strongly-correlated systems can host many intriguing phenomena, including cases where electrons are effectively 'fractionalized' into parts. Their study is however challenging, due to the rareness of both material systems and detection probes. 2D materials have recently become a new material platform to search for strongly-correlated phenomena with their flexibility, versality and high device quality. Among various 2D materials, WTe2 has a special anisotropic lattice structure and hosts strong correlation, topology and spin-orbit coupling simultaneously. In this thesis, I presented several experimental studies related to the strongly-correlated phenomena in monolayer WTe2 and its moire structures.First, I present our discovery of a new quantum state, i.e. a 2D anisotropic Luttinger Liquid state in small angle twisted bilayer WTe2 (tWTe2). Its characteristics include an exceptionally high transport anisotropy, a power-law scaling behavior characteristic for Luttinger Liquid physics along the hard direction, and a non-linear differential resistance along the easy direction. Our results provide direct experimental evidence for 2D Luttinger liquid physics at ultralow temperatures, whose stability was a question under debate in theory. It opens up new possibilities to study non-Fermi liquid phenomena in a new regime. Second, novel excitations are observed in the insulating state of monolayer WTe2. Undoped mono-layer WTe2 is a quantum spin Hall insulator, but the insulating bulk state is beyond a simple band picture. I present evidence for the insulating WTe2 to be an excitonic insulator. More surprisingly, quantum oscillations mimicking the characteristic Shubnikov-de Haas (SdH) oscillations in metals are observed in the insulating state of monolayer WTe2. We discuss possible explanations and a comprehensive understanding of such states is important to the search for a class of new quantum matter such as neutral Fermi surface state in insulators.
■590 ▼aSchool code: 0181.
■650 4▼aCondensed matter physics
■650 4▼aPhysics
■650 4▼aQuantum physics
■653 ▼aShubnikov-de Haas
■653 ▼a2D anisotropic
■653 ▼aLow energy
■653 ▼aFermi Liquid theory
■653 ▼aQuantum states
■690 ▼a0611
■690 ▼a0605
■690 ▼a0599
■71020▼aPrinceton University▼bElectrical and Computer Engineering.
■7730 ▼tDissertations Abstracts International▼g86-06B.
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164221▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
