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Doped Mott Hamiltonians
Doped Mott Hamiltonians
Doped Mott Hamiltonians

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자료유형  
 학위논문 서양
최종처리일시  
20260202105210
ISBN  
9798291563847
DDC  
530
저자명  
Yeo, Luke.
서명/저자  
Doped Mott Hamiltonians
발행사항  
[Sl] : University of Illinois at Urbana-Champaign, 2023
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2023
형태사항  
95 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Clark, Bryan.
학위논문주기  
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2023.
초록/해제  
요약The cuprates, known to superconduct at exceptionally high temperatures when they are doped with holes, all descend from parent compounds that are standard Mott insulators. Because conductivity in these materials is dominated by transport within the copper-oxide planes, we focus our attention on the electronic structure of a single copper-oxide plane. These are well-described at low temperatures by the 2d Hubbard model, which, over the past sixty years, has been largely immune to analytic treatment in the physically relevant parameter regime. A simplification of the 2d Hubbard model is therefore in order, if we are to understand the microscopic basis for high-temperature superconductivity in the cuprates. While phase transitions around the Mott insulator lack a symmetry-based description, their phases are characterized by the spectral features associated with Mottness. These include a separation of spectral weight into upper and lower Hubbard bands, a Luttinger surface of zeros in the single-electron propagator, and spectral weight transfer from high to low energies. In this thesis, we turn from 2d Hubbard to the Hatsugai-Kohmoto (HK) model, which retains the features of Mottness while providing analytic traction. For instance, we can calculate all important physical observables as well as the finite- and zero-temperature state. In chapter 5, we examine entanglement and entropy across the interaction-driven metal-insulator transition in the HK model, finding features that distinguish the HK metal from Fermi liquid-like band metals. In chapter 6, we find that the HK metal is unstable to superconductivity and proceed to study a mean field theory of this superconducting phase. This superconductor displays a number of features found in the cuprates. These include Bogoliubov-like electronic excitations that descend from the HK metal and the appearance of a color change (i.e. the transfer of spectral weight from high to low energies brought about by the onset of superconductivity). Overall we find that this simple Hamiltonian can model coarse spectral features of the Mott insulating, metallic, and superconducting phases of the underdoped cuprates. Its simplicity provides a clear view of the microscopics that emerge as this doped Mott system and its superconducting instability.
일반주제명  
Condensed matter physics
일반주제명  
Theoretical physics
일반주제명  
Physical chemistry
일반주제명  
Materials science
키워드  
Superconductivity
키워드  
Mottness
키워드  
Strongly-correlated electrons
키워드  
Cuprates
키워드  
Copper-oxide planes
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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■0820  ▼a530
■1001  ▼aYeo,  Luke.
■24510▼aDoped  Mott  Hamiltonians
■260    ▼a[Sl]▼bUniversity  of  Illinois  at  Urbana-Champaign▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a95  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Clark,  Bryan.
■5021  ▼aThesis  (Ph.D.)--University  of  Illinois  at  Urbana-Champaign,  2023.
■520    ▼aThe  cuprates,  known  to  superconduct  at  exceptionally  high  temperatures  when  they  are  doped  with  holes,  all  descend  from  parent  compounds  that  are  standard  Mott  insulators.  Because  conductivity  in  these  materials  is  dominated  by  transport  within  the  copper-oxide  planes,  we  focus  our  attention  on  the  electronic  structure  of  a  single  copper-oxide  plane.  These  are  well-described  at  low  temperatures  by  the  2d  Hubbard  model,  which,  over  the  past  sixty  years,  has  been  largely  immune  to  analytic  treatment  in  the  physically  relevant  parameter  regime.  A  simplification  of  the  2d  Hubbard  model  is  therefore  in  order,  if  we  are  to  understand  the  microscopic  basis  for  high-temperature  superconductivity  in  the  cuprates.  While  phase  transitions  around  the  Mott  insulator  lack  a  symmetry-based  description,  their  phases  are  characterized  by  the  spectral  features  associated  with  Mottness.  These  include  a  separation  of  spectral  weight  into  upper  and  lower  Hubbard  bands,  a  Luttinger  surface  of  zeros  in  the  single-electron  propagator,  and  spectral  weight  transfer  from  high  to  low  energies.  In  this  thesis,  we  turn  from  2d  Hubbard  to  the  Hatsugai-Kohmoto  (HK)  model,  which  retains  the  features  of  Mottness  while  providing  analytic  traction.  For  instance,  we  can  calculate  all  important  physical  observables  as  well  as  the  finite-  and  zero-temperature  state.  In  chapter  5,  we  examine  entanglement  and  entropy  across  the  interaction-driven  metal-insulator  transition  in  the  HK  model,  finding  features  that  distinguish  the  HK  metal  from  Fermi  liquid-like  band  metals.  In  chapter  6,  we  find  that  the  HK  metal  is  unstable  to  superconductivity  and  proceed  to  study  a  mean  field  theory  of  this  superconducting  phase.  This  superconductor  displays  a  number  of  features  found  in  the  cuprates.  These  include  Bogoliubov-like  electronic  excitations  that  descend  from  the  HK  metal  and  the  appearance  of  a  color  change  (i.e.  the  transfer  of  spectral  weight  from  high  to  low  energies  brought  about  by  the  onset  of  superconductivity).  Overall  we  find  that  this  simple  Hamiltonian  can  model  coarse  spectral  features  of  the  Mott  insulating,  metallic,  and  superconducting  phases  of  the  underdoped  cuprates.  Its  simplicity  provides  a  clear  view  of  the  microscopics  that  emerge  as  this  doped  Mott  system  and  its  superconducting  instability.
■590    ▼aSchool  code:  0090.
■650  4▼aCondensed  matter  physics
■650  4▼aTheoretical  physics
■650  4▼aPhysical  chemistry
■650  4▼aMaterials  science
■653    ▼aSuperconductivity
■653    ▼aMottness
■653    ▼aStrongly-correlated  electrons
■653    ▼aCuprates
■653    ▼aCopper-oxide  planes
■690    ▼a0611
■690    ▼a0753
■690    ▼a0794
■690    ▼a0494
■71020▼aUniversity  of  Illinois  at  Urbana-Champaign▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0090
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359768▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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