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Disorder Effects in the Kitaev Spin Liquid
Disorder Effects in the Kitaev Spin Liquid
Disorder Effects in the Kitaev Spin Liquid

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211152936
ISBN  
9798342715843
DDC  
530
저자명  
Kao, Wen-Han.
서명/저자  
Disorder Effects in the Kitaev Spin Liquid
발행사항  
[Sl] : University of Minnesota, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
229 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
주기사항  
Advisor: Perkins, Natalia.
학위논문주기  
Thesis (Ph.D.)--University of Minnesota, 2024.
초록/해제  
요약One of the long-standing open questions in condensed matter physics, which has recently garnered significant attention, is how a quantum spin liquid (QSL) state responds to the various forms of structural disorder that are inevitable in real materials.Despite numerous theoretical proposals and candidate materials for QSLs over the past half-century, the existence of this exotic magnetic phase remains contentious due to two primary challenges in experimental identification. First, the absence of long-range magnetic order in QSLs results in a featureless ground state, making its characterization largely dependent on the excitation spectrum and dynamical probes. Second, the unavoidable presence of structural disorder in real materials can significantly affect the spin-liquid phase or even lead to its destruction. This underscores the urgent need for a deeper understanding of the effects of disorder in quantum spin liquids.The Kitaev honeycomb model, discovered in 2006, is an exactly solvable model that hosts quantum spin liquid phases and holds the potential for realization in transition-metal compounds with strong spin-orbit coupling. The spin fractionalization into locally conserved fluxes and itinerant Majorana fermions underpins the model's exact solvability, even in real-space representation. This characteristic makes the Kitaev model an ideal testbed for studying disorder effects in quantum spin liquids, allowing us to address the aforementioned challenges by enabling the calculation of the energy spectrum and dynamical response without relying on translational invariance.In this dissertation, various aspects of disorder within the Kitaev spin liquid model have been explored, including disorder-induced flux binding, localization of Majorana modes, power-law divergence in the density of states, signatures of Majorana zero modes in the local dynamical correlation function, and strong-disorder criticality in the quasi-one-dimensional Kitaev model. These studies provide not only a deeper understanding of the role of disorder in the Kitaev spin liquid, but also propose potentially observable consequences in thermal conductivity, specific heat, and inelastic tunneling conductance.
일반주제명  
Physics
일반주제명  
Electromagnetics
일반주제명  
Condensed matter physics
일반주제명  
Quantum physics
키워드  
Disorder effects
키워드  
Frustrated magnetism
키워드  
Quantum materials
키워드  
Quantum spin liquids
키워드  
Scanning tunneling microscopy
기타저자  
University of Minnesota Physics
기본자료저록  
Dissertations Abstracts International. 86-05B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■0820  ▼a530
■1001  ▼aKao,  Wen-Han.
■24510▼aDisorder  Effects  in  the  Kitaev  Spin  Liquid
■260    ▼a[Sl]▼bUniversity  of  Minnesota▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a229  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-05,  Section:  B.
■500    ▼aAdvisor:  Perkins,  Natalia.
■5021  ▼aThesis  (Ph.D.)--University  of  Minnesota,  2024.
■520    ▼aOne  of  the  long-standing  open  questions  in  condensed  matter  physics,  which  has  recently  garnered  significant  attention,  is  how  a  quantum  spin  liquid  (QSL)  state  responds  to  the  various  forms  of  structural  disorder  that  are  inevitable  in  real  materials.Despite  numerous  theoretical  proposals  and  candidate  materials  for  QSLs  over  the  past  half-century,  the  existence  of  this  exotic  magnetic  phase  remains  contentious  due  to  two  primary  challenges  in  experimental  identification.  First,  the  absence  of  long-range  magnetic  order  in  QSLs  results  in  a  featureless  ground  state,  making  its  characterization  largely  dependent  on  the  excitation  spectrum  and  dynamical  probes.  Second,  the  unavoidable  presence  of  structural  disorder  in  real  materials  can  significantly  affect  the  spin-liquid  phase  or  even  lead  to  its  destruction.  This  underscores  the  urgent  need  for  a  deeper  understanding  of  the  effects  of  disorder  in  quantum  spin  liquids.The  Kitaev  honeycomb  model,  discovered  in  2006,  is  an  exactly  solvable  model  that  hosts  quantum  spin  liquid  phases  and  holds  the  potential  for  realization  in  transition-metal  compounds  with  strong  spin-orbit  coupling.  The  spin  fractionalization  into  locally  conserved  fluxes  and  itinerant  Majorana  fermions  underpins  the  model's  exact  solvability,  even  in  real-space  representation.  This  characteristic  makes  the  Kitaev  model  an  ideal  testbed  for  studying  disorder  effects  in  quantum  spin  liquids,  allowing  us  to  address  the  aforementioned  challenges  by  enabling  the  calculation  of  the  energy  spectrum  and  dynamical  response  without  relying  on  translational  invariance.In  this  dissertation,  various  aspects  of  disorder  within  the  Kitaev  spin  liquid  model  have  been  explored,  including  disorder-induced  flux  binding,  localization  of  Majorana  modes,  power-law  divergence  in  the  density  of  states,  signatures  of  Majorana  zero  modes  in  the  local  dynamical  correlation  function,  and  strong-disorder  criticality  in  the  quasi-one-dimensional  Kitaev  model.  These  studies  provide  not  only  a  deeper  understanding  of  the  role  of  disorder  in  the  Kitaev  spin  liquid,  but  also  propose  potentially  observable  consequences  in  thermal  conductivity,  specific  heat,  and  inelastic  tunneling  conductance.
■590    ▼aSchool  code:  0130.
■650  4▼aPhysics
■650  4▼aElectromagnetics
■650  4▼aCondensed  matter  physics
■650  4▼aQuantum  physics
■653    ▼aDisorder  effects
■653    ▼aFrustrated  magnetism
■653    ▼aQuantum  materials
■653    ▼aQuantum  spin  liquids
■653    ▼aScanning  tunneling  microscopy
■690    ▼a0605
■690    ▼a0599
■690    ▼a0611
■690    ▼a0607
■71020▼aUniversity  of  Minnesota▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-05B.
■790    ▼a0130
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164227▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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