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Quantum Criticality and Superconductivity in Systems Without Quasiparticles
Quantum Criticality and Superconductivity in Systems Without Quasiparticles
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151437
- ISBN
- 9798382777344
- DDC
- 530
- 저자명
- Li, Chenyuan.
- 서명/저자
- Quantum Criticality and Superconductivity in Systems Without Quasiparticles
- 발행사항
- [Sl] : Harvard University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 213 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Advisor: Sachdev, Subir.
- 학위논문주기
- Thesis (Ph.D.)--Harvard University, 2024.
- 초록/해제
- 요약The discovery of high-temperature superconductors has raises questions that extend beyond the scope of quasiparticles, a foundational concept in condensed matter theory. This dissertation explores new theoretical approaches to quantum matter without quasiparticle excitations, with a particular focus on quantum criticality and the associated superconductivity in correlated electron compounds.The soluble Sachdev-Ye-Kitaev (SYK) model has recently emerged as a fascinating platform to address the unusual metallic states with T-linear resistivity. We first consider different variants of random Hubbard models, which share many similarities to key aspects of the original SYK model. Using a large M analysis and a renormalization group method, we propose the existence of quantum critical points with fractionalized excitations separating two distinct phases, which provides insights into the quantum phase transitions and non-Fermi liquid behaviors observed in cuprate superconductors.In the second part of this dissertation, we examine the interplay between non-Fermi liquids and superconductivity with two different pairing mechanisms. Under the framework of random Hubbard model, we demonstrate that superconductivity emerging from non-Fermi liquids strongly deviates from the BCS theory by tuning the relative strength of hopping and exchange interactions. Furthermore, we investigate a two-dimensional Yukawa-SYK model with spatially randomn interactions coupling a Fermi surface to a scalar field associated with a quantum phase transition. Our theory agrees well with transport properties analysed in cuprates, such as a T-linear resistivity and Planckian dissipation.
- 일반주제명
- Physics
- 일반주제명
- Condensed matter physics
- 일반주제명
- Quantum physics
- 키워드
- Superconductors
- 키워드
- Quasiparticles
- 키워드
- Hubbard model
- 기타저자
- Harvard University Physics
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151437
■006m o d
■007cr#unu||||||||
■020 ▼a9798382777344
■035 ▼a(MiAaPQ)AAI31295767
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aLi, Chenyuan.▼0(orcid)0000-0001-8566-1462
■24510▼aQuantum Criticality and Superconductivity in Systems Without Quasiparticles
■260 ▼a[Sl]▼bHarvard University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a213 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: Sachdev, Subir.
■5021 ▼aThesis (Ph.D.)--Harvard University, 2024.
■520 ▼aThe discovery of high-temperature superconductors has raises questions that extend beyond the scope of quasiparticles, a foundational concept in condensed matter theory. This dissertation explores new theoretical approaches to quantum matter without quasiparticle excitations, with a particular focus on quantum criticality and the associated superconductivity in correlated electron compounds.The soluble Sachdev-Ye-Kitaev (SYK) model has recently emerged as a fascinating platform to address the unusual metallic states with T-linear resistivity. We first consider different variants of random Hubbard models, which share many similarities to key aspects of the original SYK model. Using a large M analysis and a renormalization group method, we propose the existence of quantum critical points with fractionalized excitations separating two distinct phases, which provides insights into the quantum phase transitions and non-Fermi liquid behaviors observed in cuprate superconductors.In the second part of this dissertation, we examine the interplay between non-Fermi liquids and superconductivity with two different pairing mechanisms. Under the framework of random Hubbard model, we demonstrate that superconductivity emerging from non-Fermi liquids strongly deviates from the BCS theory by tuning the relative strength of hopping and exchange interactions. Furthermore, we investigate a two-dimensional Yukawa-SYK model with spatially randomn interactions coupling a Fermi surface to a scalar field associated with a quantum phase transition. Our theory agrees well with transport properties analysed in cuprates, such as a T-linear resistivity and Planckian dissipation.
■590 ▼aSchool code: 0084.
■650 4▼aPhysics
■650 4▼aCondensed matter physics
■650 4▼aQuantum physics
■653 ▼aCondensed matter theory
■653 ▼aSuperconductors
■653 ▼aQuasiparticles
■653 ▼aHubbard model
■653 ▼aQuantum phase transition
■690 ▼a0605
■690 ▼a0599
■690 ▼a0611
■71020▼aHarvard University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0084
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161732▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
