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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...
Anomalous Metals and Quantum Superconductor-Metal-Insulator Transitions in Two-Dimensional Granular Superconductors

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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  
High temperature superconductors
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  
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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
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■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.

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