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Developing Josephson Junction Microwave Spectroscopy as a Modality Compatible With Scanned Probe Microscopy at LHe Temperatures
Developing Josephson Junction Microwave Spectroscopy as a Modality Compatible With Scanned...
Developing Josephson Junction Microwave Spectroscopy as a Modality Compatible With Scanned Probe Microscopy at LHe Temperatures

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202103704
ISBN  
9798283478944
DDC  
530
저자명  
Fortman, Margaret.
서명/저자  
Developing Josephson Junction Microwave Spectroscopy as a Modality Compatible With Scanned Probe Microscopy at LHe Temperatures
발행사항  
[Sl] : The University of Wisconsin - Madison, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
159 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Brar, Victor.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
초록/해제  
요약Developing new diagnostic tools to understand superconducting surface impurities is crucial for the future of quantum superconducting circuity as well as probing new emergent states in condensed matter. Josephson junction spectroscopy (JJS) in a scanned geometry offers a way to probe defects in superconductors directly, while also correlating their electronic and spatial properties. In this work we show advances towards implementing JJS in a scanning tunneling microscope (STM), where the Josephson junction is created between the superconducting tip and superconducting sample. We first present a way to perform this measurement in an STM by creating a new type of tip that leverages the HF filtering properties of a large tip-sample capacitance design. To demonstrate the benefit of this approach, we then show how a large cross junction capacitance improves performance at elevated temperatures using fabricated Nb-based Josephson junction devices. We also discuss the development of iron selenide as a promising superconducting surface on which to implement this technique. Lastly, we present results of our high capacitance STM tip showing its ability to decrease thermal noise and P(E)-broadening and discuss future possibilities of this tool.
일반주제명  
Physics
일반주제명  
Applied physics
일반주제명  
Quantum physics
키워드  
Josephson junction spectroscopy
키워드  
Scanning tunneling microscope
키워드  
Iron selenide
기타저자  
The University of Wisconsin - Madison Physics
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aFortman,  Margaret.
■24510▼aDeveloping  Josephson  Junction  Microwave  Spectroscopy  as  a  Modality  Compatible  With  Scanned  Probe  Microscopy  at  LHe  Temperatures
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a159  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Brar,  Victor.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2025.
■520    ▼aDeveloping  new  diagnostic  tools  to  understand  superconducting  surface  impurities  is  crucial  for  the  future  of  quantum  superconducting  circuity  as  well  as  probing  new  emergent  states  in  condensed  matter.  Josephson  junction  spectroscopy  (JJS)  in  a  scanned  geometry  offers  a  way  to  probe  defects  in  superconductors  directly,  while  also  correlating  their  electronic  and  spatial  properties.  In  this  work  we  show  advances  towards  implementing  JJS  in  a  scanning  tunneling  microscope  (STM),  where  the  Josephson  junction  is  created  between  the  superconducting  tip  and  superconducting  sample.  We  first  present  a  way  to  perform  this  measurement  in  an  STM  by  creating  a  new  type  of  tip  that  leverages  the  HF  filtering  properties  of  a  large  tip-sample  capacitance  design.  To  demonstrate  the  benefit  of  this  approach,  we  then  show  how  a  large  cross  junction  capacitance  improves  performance  at  elevated  temperatures  using  fabricated  Nb-based  Josephson  junction  devices.    We  also  discuss  the  development  of  iron  selenide  as  a  promising  superconducting  surface  on  which  to  implement  this  technique.  Lastly,  we  present  results  of  our  high  capacitance  STM  tip  showing  its  ability  to  decrease  thermal  noise  and  P(E)-broadening  and  discuss  future  possibilities  of  this  tool.
■590    ▼aSchool  code:  0262.
■650  4▼aPhysics
■650  4▼aApplied  physics
■650  4▼aQuantum  physics
■653    ▼aJosephson  junction  spectroscopy
■653    ▼aScanning  tunneling  microscope
■653    ▼aIron  selenide
■690    ▼a0605
■690    ▼a0599
■690    ▼a0215
■71020▼aThe  University  of  Wisconsin  -  Madison▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358246▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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