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Phase Sensitive Transport Measurements on Exotic Superconductors
Phase Sensitive Transport Measurements on Exotic Superconductors
Phase Sensitive Transport Measurements on Exotic Superconductors

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152020
ISBN  
9798384466147
DDC  
530
저자명  
Zhu, Zheyi.
서명/저자  
Phase Sensitive Transport Measurements on Exotic Superconductors
발행사항  
[Sl] : Princeton University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
116 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
주기사항  
Advisor: Ong, Nai Phuan.
학위논문주기  
Thesis (Ph.D.)--Princeton University, 2024.
초록/해제  
요약The phase of the order parameter in superconductivity is a fundamental concept that explains the coherent quantum state of the electron pairs across the superconductor. Probing the phase of the order parameter in superconductors is essential for understanding and utilizing their unique quantum properties. This thesis presents two different transport experiments that investigate the order parameter phase in two exotic superconductivity systems, respectively.The first system is MoTe2, a type-II Weyl semimetal that exhibits superconductivity at ultra-low temperatures. The interplay between topological band structure and superconducting pairing condensate has attracted considerable interest. We investigated the planar Al-MoTe2-Al Josephson junction using the asymmetric SQUID technique to simultaneously achieve control of the phase difference across the junction and the proximity effect from s-wave aluminum superconductivity into MoTe2. We observed subharmonic gap structure in the finite voltage regime of the MoTe2 junction and attributed it to multiple Andreev reflection (MAR). Additionally, we explored the phase tuning of MAR both above and below the critical temperature Tc of MoTe2. Coherent supercurrent transport inferred from MAR is discussed.The second system is infinite-layer nickelates Nd1-xSrxNiO2, an unconventional type-II superconductor isostructural to well-known high-Tc cuprate superconductors. An Abrikosov vortex in a Type-II superconductor under a magnetic field carries one quantum of magnetic flux and exhibits a 2π phase singularity. The dynamics of these vortices under electric current or thermal gradient provide critical insights into the superconductivity of these materials. We investigated the thermoelectric response in Nd1-xSrxNiO2 thin film subjected to a vertical magnetic field and observed a significant nonlinear Nernst effect in extended temperature regime, even above Tc. This Nernst signal, identified as vortex Nernst effect, arises from the movement of vortices with 2π phase singularity and generates an electric field through the Josephson effect. With the revealed information on superconducting parameter phase, we provide evidence of vortex-liquid phase in nickelates, which shows a strong similarity to that of high Tc cuprates.
일반주제명  
Physics
일반주제명  
Electromagnetics
일반주제명  
Applied physics
일반주제명  
Quantum physics
키워드  
Coherent quantum state
키워드  
Superconductivity
키워드  
Magnetic flux
키워드  
Multiple Andreev reflection
기타저자  
Princeton University Physics
기본자료저록  
Dissertations Abstracts International. 86-04B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

 008250123s2024        us                              c    eng  d
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■00520250211152020
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798384466147
■035    ▼a(MiAaPQ)AAI31332140
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aZhu,  Zheyi.
■24510▼aPhase  Sensitive  Transport  Measurements  on  Exotic  Superconductors
■260    ▼a[Sl]▼bPrinceton  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a116  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-04,  Section:  B.
■500    ▼aAdvisor:  Ong,  Nai  Phuan.
■5021  ▼aThesis  (Ph.D.)--Princeton  University,  2024.
■520    ▼aThe  phase  of  the  order  parameter  in  superconductivity  is  a  fundamental  concept  that  explains  the  coherent  quantum  state  of  the  electron  pairs  across  the  superconductor.  Probing  the  phase  of  the  order  parameter  in  superconductors  is  essential  for  understanding  and  utilizing  their  unique  quantum  properties.  This  thesis  presents  two  different  transport  experiments  that  investigate  the  order  parameter  phase  in  two  exotic  superconductivity  systems,  respectively.The  first  system  is  MoTe2,  a  type-II  Weyl  semimetal  that  exhibits  superconductivity  at  ultra-low  temperatures.  The  interplay  between  topological  band  structure  and  superconducting  pairing  condensate  has  attracted  considerable  interest.  We  investigated  the  planar  Al-MoTe2-Al  Josephson  junction  using  the  asymmetric  SQUID  technique  to  simultaneously  achieve  control  of  the  phase  difference  across  the  junction  and  the  proximity  effect  from  s-wave  aluminum  superconductivity  into  MoTe2.  We  observed  subharmonic  gap  structure  in  the  finite  voltage  regime  of  the  MoTe2  junction  and  attributed  it  to  multiple  Andreev  reflection  (MAR).  Additionally,  we  explored  the  phase  tuning  of  MAR  both  above  and  below  the  critical  temperature  Tc  of  MoTe2.  Coherent  supercurrent  transport  inferred  from  MAR  is  discussed.The  second  system  is  infinite-layer  nickelates  Nd1-xSrxNiO2,  an  unconventional  type-II  superconductor  isostructural  to  well-known  high-Tc  cuprate  superconductors.  An  Abrikosov  vortex  in  a  Type-II  superconductor  under  a  magnetic  field  carries  one  quantum  of  magnetic  flux  and  exhibits  a  2π  phase  singularity.  The  dynamics  of  these  vortices  under  electric  current  or  thermal  gradient  provide  critical  insights  into  the  superconductivity  of  these  materials.  We  investigated  the  thermoelectric  response  in  Nd1-xSrxNiO2  thin  film  subjected  to  a  vertical  magnetic  field  and  observed  a  significant  nonlinear  Nernst  effect  in  extended  temperature  regime,  even  above  Tc.  This  Nernst  signal,  identified  as  vortex  Nernst  effect,  arises  from  the  movement  of  vortices  with  2π  phase  singularity  and  generates  an  electric  field  through  the  Josephson  effect.  With  the  revealed  information  on  superconducting  parameter  phase,  we  provide  evidence  of  vortex-liquid  phase  in  nickelates,  which  shows  a  strong  similarity  to  that  of  high  Tc  cuprates.
■590    ▼aSchool  code:  0181.
■650  4▼aPhysics
■650  4▼aElectromagnetics
■650  4▼aApplied  physics
■650  4▼aQuantum  physics
■653    ▼aCoherent  quantum  state
■653    ▼aSuperconductivity
■653    ▼aMagnetic  flux
■653    ▼aMultiple  Andreev  reflection
■690    ▼a0605
■690    ▼a0599
■690    ▼a0215
■690    ▼a0607
■71020▼aPrinceton  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-04B.
■790    ▼a0181
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162505▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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