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Anomalous Metals and Quantum Superconductor-Metal-Insulator Transitions in Two-Dimensional Granular Superconductors
Anomalous Metals and Quantum Superconductor-Metal-Insulator Transitions in Two-Dimensional Granular Superconductors
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152121
- ISBN
- 9798384340676
- DDC
- 600
- 저자명
- Zhang, Xinyang.
- 서명/저자
- Anomalous Metals and Quantum Superconductor-Metal-Insulator Transitions in Two-Dimensional Granular Superconductors
- 발행사항
- [Sl] : Stanford University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 165 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Kapitulnik, Aharon.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2024.
- 초록/해제
- 요약Many experiments investigating superconductor-insulator transition (SIT) exhibited low-temperature resistance saturation, which was interpreted as an anomalous metallic (AM) phase emerging from a "failed" superconductor, thus challenging conventional theory. In this thesis, I studied a two-dimensional granular system of random array of indium islands grown on amorphous indium-oxide. By tuning the inter-grain couplings, we observed robust AM behavior under careful electromagnetic filtering and within a wide range of linear response. Exposure to external broadband noise or microwave radiation was shown to strengthen the tendency of superconductivity, promoting phase coherence in the granular system.In light of observed vestiges of the true self-duality typically associated with a magnetic-field-tuned SIT (H-SIT), we extended the analysis to a similar AM phase originating from a "failed" insulator, thus completing an exploration of the quantum superconductor-metal-insulator transitions. The granular morphology of the material implies a system of Josephson junctions with a broad distribution of Josephson coupling EJ and charging energy EC, with an H-SIT determined by the competition between EJ and EC. Aiming to understand the AM behavior from a duality perspective, we invoked macroscopic quantum tunneling effects to explain the temperature-independent resistance where the "failed" superconductor/insulator results from quantum fluctuations of phase/charge.Furthermore, we examined the system's low-frequency electrodynamic response, using our custom-built highly-sensitive mutual inductance probe. This allowed us to extend resistance measurement to the micro-Ohm regime and to extract quantitative information of the dynamical response in the quantum critical regime proximate to the quantum superconductor-metal transition. The coexistence of robust superfluid density and dissipative response pointed to a possible form of gapless superconductivity in granular superconductors. Building upon a series of systematic studies, we have established a holistic understanding of the robust and ubiquitous AM phase in two-dimensional granular superconductors.
- 일반주제명
- Metals
- 일반주제명
- Phase transitions
- 일반주제명
- Energy
- 일반주제명
- Electrons
- 일반주제명
- Superconductivity
- 일반주제명
- Vortices
- 일반주제명
- Electromagnetism
- 일반주제명
- Thin films
- 일반주제명
- Magnetic fields
- 일반주제명
- Electric fields
- 일반주제명
- Atomic physics
- 일반주제명
- Condensed matter physics
- 일반주제명
- Electromagnetics
- 일반주제명
- High temperature physics
- 일반주제명
- Low temperature physics
- 일반주제명
- Materials science
- 일반주제명
- Thermodynamics
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■1001 ▼aZhang, Xinyang.
■24510▼aAnomalous Metals and Quantum Superconductor-Metal-Insulator Transitions in Two-Dimensional Granular Superconductors
■260 ▼a[Sl]▼bStanford University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a165 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Kapitulnik, Aharon.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2024.
■520 ▼aMany experiments investigating superconductor-insulator transition (SIT) exhibited low-temperature resistance saturation, which was interpreted as an anomalous metallic (AM) phase emerging from a "failed" superconductor, thus challenging conventional theory. In this thesis, I studied a two-dimensional granular system of random array of indium islands grown on amorphous indium-oxide. By tuning the inter-grain couplings, we observed robust AM behavior under careful electromagnetic filtering and within a wide range of linear response. Exposure to external broadband noise or microwave radiation was shown to strengthen the tendency of superconductivity, promoting phase coherence in the granular system.In light of observed vestiges of the true self-duality typically associated with a magnetic-field-tuned SIT (H-SIT), we extended the analysis to a similar AM phase originating from a "failed" insulator, thus completing an exploration of the quantum superconductor-metal-insulator transitions. The granular morphology of the material implies a system of Josephson junctions with a broad distribution of Josephson coupling EJ and charging energy EC, with an H-SIT determined by the competition between EJ and EC. Aiming to understand the AM behavior from a duality perspective, we invoked macroscopic quantum tunneling effects to explain the temperature-independent resistance where the "failed" superconductor/insulator results from quantum fluctuations of phase/charge.Furthermore, we examined the system's low-frequency electrodynamic response, using our custom-built highly-sensitive mutual inductance probe. This allowed us to extend resistance measurement to the micro-Ohm regime and to extract quantitative information of the dynamical response in the quantum critical regime proximate to the quantum superconductor-metal transition. The coexistence of robust superfluid density and dissipative response pointed to a possible form of gapless superconductivity in granular superconductors. Building upon a series of systematic studies, we have established a holistic understanding of the robust and ubiquitous AM phase in two-dimensional granular superconductors.
■590 ▼aSchool code: 0212.
■650 4▼aMetals
■650 4▼aPhase transitions
■650 4▼aEnergy
■650 4▼aElectrons
■650 4▼aSuperconductivity
■650 4▼aHigh temperature superconductors
■650 4▼aVortices
■650 4▼aElectromagnetism
■650 4▼aThin films
■650 4▼aMagnetic fields
■650 4▼aElectric fields
■650 4▼aAtomic physics
■650 4▼aCondensed matter physics
■650 4▼aElectromagnetics
■650 4▼aHigh temperature physics
■650 4▼aLow temperature physics
■650 4▼aMaterials science
■650 4▼aThermodynamics
■690 ▼a0791
■690 ▼a0748
■690 ▼a0611
■690 ▼a0607
■690 ▼a0597
■690 ▼a0598
■690 ▼a0794
■690 ▼a0348
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162992▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


