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Exploring the Strongly Correlated Realm of Electrons Using Scanning Tunneling Spectroscopy
Exploring the Strongly Correlated Realm of Electrons Using Scanning Tunneling Spectroscopy
Exploring the Strongly Correlated Realm of Electrons Using Scanning Tunneling Spectroscopy

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105209
ISBN  
9798291563793
DDC  
530
저자명  
Aishwarya, Anuva.
서명/저자  
Exploring the Strongly Correlated Realm of Electrons Using Scanning Tunneling Spectroscopy
발행사항  
[Sl] : University of Illinois at Urbana-Champaign, 2023
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2023
형태사항  
130 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Mason, Nadya.
학위논문주기  
Thesis (Ph.D.Physics.)--University of Illinois at Urbana-Champaign, 2023.
초록/해제  
요약Strong correlations between electrons in materials give rise to a wide variety of exotic and unusual phenomena like unconventional superconductivity, spin and charge ordering and fractionalization of quasiparticles. This dissertation comprises three bodies of experiments, where strongly correlated electron systems have been studied to unearth novel phenomena using the technique of scanning tunneling microscopy and spectroscopy. The first work is an experimental discovery of long lifetime spin excitations near the domain walls (DWs) of a transition metal dichalcogenide Mott insulator, namely 1T − TaS2. 1T − TaS2 is a Mott insulator on a triangular lattice with a frustrated, putative quantum spin liquid ground state. However, charge denity wave (CDW) DWs give rise to short ranged antiferromagnetic spin-ordering with long lifetimes. These results have been published in Proceedings of the National Academy of Sciences, 119 (22) e2121740119, (2022). The second work is the development of a novel form of spectroscopic technique using nanowires of topological Kondo insulators as probe tips. In this work, using state-of-the-art nanofabrication techniques we have harvested nanowires of SmB6, a strongly correlated electron system and a candidate topological Kondo insulator, as probe tips for tunneling microscopy. Our work paves the way for a new generation of STM spectroscopy using functionalized nanowires to probe and manipulate emergent excitations in materials. The detailed results have been published in Science, 377, 6611 (2022). The final set of experiments are on UTe2, which combines triplet-superconductivity and non-trivial topology with strong correlations. In this work we have employed scanning tunneling microscopy and spectroscopy at 300 mK to uncover the existence of an unusual incommensurate CDW order which is suppressed by an external magnetic field and vanishes at the upper critical field Hc2 of the superconducting order. This behavior has been explained by using a Ginzburg-Landau theory for a uniform triplet superconductor coexisting with triplet pair density wave (PDW) state. PDWs in the absence of magnetic field need strong correlations to exist. While many previous works describe singlet PDW states, triplet PDWs have not been considered before by theory or observed in experiments. This work has been accepted to be published in Nature 2023 but can be accessed at arXiv:2207.09491v2.
일반주제명  
Condensed matter physics
일반주제명  
Applied physics
일반주제명  
Physics
키워드  
Scanning tunneling microscope
키워드  
Spectroscopy
키워드  
Correlated electrons
키워드  
Mott insulators
키워드  
Superconductors
기타저자  
University of Illinois at Urbana-Champaign Physics
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aAishwarya,  Anuva.
■24510▼aExploring  the  Strongly  Correlated  Realm  of  Electrons  Using  Scanning  Tunneling  Spectroscopy
■260    ▼a[Sl]▼bUniversity  of  Illinois  at  Urbana-Champaign▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a130  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Mason,  Nadya.
■5021  ▼aThesis  (Ph.D.Physics.)--University  of  Illinois  at  Urbana-Champaign,  2023.
■520    ▼aStrong  correlations  between  electrons  in  materials  give  rise  to  a  wide  variety  of  exotic  and  unusual  phenomena  like  unconventional  superconductivity,  spin  and  charge  ordering  and  fractionalization  of  quasiparticles.  This  dissertation  comprises  three  bodies  of  experiments,  where  strongly  correlated  electron  systems  have  been  studied  to  unearth  novel  phenomena  using  the  technique  of  scanning  tunneling  microscopy  and  spectroscopy.  The  first  work  is  an  experimental  discovery  of  long  lifetime  spin  excitations  near  the  domain  walls  (DWs)  of  a  transition  metal  dichalcogenide  Mott  insulator,  namely  1T  −  TaS2.  1T  −  TaS2  is  a  Mott  insulator  on  a  triangular  lattice  with  a  frustrated,  putative  quantum  spin  liquid  ground  state.  However,  charge  denity  wave  (CDW)  DWs  give  rise  to  short  ranged  antiferromagnetic  spin-ordering  with  long  lifetimes.  These  results  have  been  published  in  Proceedings  of  the  National  Academy  of  Sciences,  119  (22)  e2121740119,  (2022).  The  second  work  is  the  development  of  a  novel  form  of  spectroscopic  technique  using  nanowires  of  topological  Kondo  insulators  as  probe  tips.  In  this  work,  using  state-of-the-art  nanofabrication  techniques  we  have  harvested  nanowires  of  SmB6,  a  strongly  correlated  electron  system  and  a  candidate  topological  Kondo  insulator,  as  probe  tips  for  tunneling  microscopy.  Our  work  paves  the  way  for  a  new  generation  of  STM  spectroscopy  using  functionalized  nanowires  to  probe  and  manipulate  emergent  excitations  in  materials.  The  detailed  results  have  been  published  in  Science,  377,  6611  (2022).  The  final  set  of  experiments  are  on  UTe2,  which  combines  triplet-superconductivity  and  non-trivial  topology  with  strong  correlations.  In  this  work  we  have  employed  scanning  tunneling  microscopy  and  spectroscopy  at  300  mK  to  uncover  the  existence  of  an  unusual  incommensurate  CDW  order  which  is  suppressed  by  an  external  magnetic  field  and  vanishes  at  the  upper  critical  field  Hc2  of  the  superconducting  order.  This  behavior  has  been  explained  by  using  a  Ginzburg-Landau  theory  for  a  uniform  triplet  superconductor  coexisting  with  triplet  pair  density  wave  (PDW)  state.  PDWs  in  the  absence  of  magnetic  field  need  strong  correlations  to  exist.  While  many  previous  works  describe  singlet  PDW  states,  triplet  PDWs  have  not  been  considered  before  by  theory  or  observed  in  experiments.  This  work  has  been  accepted  to  be  published  in  Nature  2023  but  can  be  accessed  at  arXiv:2207.09491v2.
■590    ▼aSchool  code:  0090.
■650  4▼aCondensed  matter  physics
■650  4▼aApplied  physics
■650  4▼aPhysics
■653    ▼aScanning  tunneling  microscope
■653    ▼aSpectroscopy
■653    ▼aCorrelated  electrons
■653    ▼aMott  insulators
■653    ▼aSuperconductors
■690    ▼a0611
■690    ▼a0215
■690    ▼a0605
■71020▼aUniversity  of  Illinois  at  Urbana-Champaign▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0090
■791    ▼aPh.D.Physics.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359764▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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