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Strongly Correlated Excitons in Moire Semiconductors
Strongly Correlated Excitons in Moire Semiconductors
Strongly Correlated Excitons in Moire Semiconductors

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202103116
ISBN  
9798286434558
DDC  
530
저자명  
Huang, Tsung-Sheng.
서명/저자  
Strongly Correlated Excitons in Moire Semiconductors
발행사항  
[Sl] : University of Maryland, College Park, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
65 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Hafezi, Mohammad.
학위논문주기  
Thesis (Ph.D.)--University of Maryland, College Park, 2025.
초록/해제  
요약Moire transition metal dichalcogenide (TMD) bilayers have emerged as a versatile platform for exploring a wide range of correlated electronic phenomena. In optical studies of these semiconducting systems, excitons-bound electron-hole pairs-play a crucial role by linking electronic correlations to optical responses. This thesis develops theoretical frameworks to understand how excitonic behavior interplays with various correlated states in moire TMD bilayers and the resulting implications for optical measurements.We begin by investigating the interaction between a single moire exciton and Wigner crystal states formed by doped electrons. Focusing on systems with repulsive electron-exciton interactions, we discuss a scenario where excitons move within the complementary lattice of the charge-ordered electrons. As different Wigner crystal configurations emerge at specific electron filling fractions, the effective exciton lattice changes accordingly, giving rise to distinct spectral and topological features. These characteristics can serve as optical signatures of the underlying charge order, and we propose a momentum- and polarization-resolved reflection experiment to detect them.Next, we turn to undoped bilayers hosting multiple moire excitons. While prior work often models these systems using a Bose-Hubbard framework, we show that their commutation relations deviate from those of conventional bosons. Instead, the excitons obey algebra similar to that of angular momentum operators, resulting in a finite Hilbert space and limiting local exciton occupancy to two or three, depending on the bilayer's specific parameters. We demonstrate that this occupancy constraint could manifest in high-intensity optical pumping experiments.Finally, we explore exciton dynamics in a doped heterobilayer where the topmost valence moire band forms an antiferromagnetic Mott insulator. We present a theoretical model describing the coupling between the exciton and the spin background, revealing that spin fluctuations substantially narrow the exciton's effective bandwidth-by orders of magnitude compared to its non-interacting counterpart. This suppression in mobility provides a measurable contrast, which we suggest can be probed through exciton diffusion experiments.
일반주제명  
Condensed matter physics
일반주제명  
Optics
일반주제명  
Quantum physics
일반주제명  
Physics
키워드  
Excitons
키워드  
Light-matter interaction
키워드  
Moire semiconductors
키워드  
Strongly correlated electrons
기타저자  
University of Maryland, College Park Physics
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798286434558
■035    ▼a(MiAaPQ)AAI31937187
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aHuang,  Tsung-Sheng.▼0(orcid)0000-0002-4137-8988
■24510▼aStrongly  Correlated  Excitons  in  Moire  Semiconductors
■260    ▼a[Sl]▼bUniversity  of  Maryland,  College  Park▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a65  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Hafezi,  Mohammad.
■5021  ▼aThesis  (Ph.D.)--University  of  Maryland,  College  Park,  2025.
■520    ▼aMoire  transition  metal  dichalcogenide  (TMD)  bilayers  have  emerged  as  a  versatile  platform  for  exploring  a  wide  range  of  correlated  electronic  phenomena.  In  optical  studies  of  these  semiconducting  systems,  excitons-bound  electron-hole  pairs-play  a  crucial  role  by  linking  electronic  correlations  to  optical  responses.  This  thesis  develops  theoretical  frameworks  to  understand  how  excitonic  behavior  interplays  with  various  correlated  states  in  moire  TMD  bilayers  and  the  resulting  implications  for  optical  measurements.We  begin  by  investigating  the  interaction  between  a  single  moire  exciton  and  Wigner  crystal  states  formed  by  doped  electrons.  Focusing  on  systems  with  repulsive  electron-exciton  interactions,  we  discuss  a  scenario  where  excitons  move  within  the  complementary  lattice  of  the  charge-ordered  electrons.  As  different  Wigner  crystal  configurations  emerge  at  specific  electron  filling  fractions,  the  effective  exciton  lattice  changes  accordingly,  giving  rise  to  distinct  spectral  and  topological  features.  These  characteristics  can  serve  as  optical  signatures  of  the  underlying  charge  order,  and  we  propose  a  momentum-  and  polarization-resolved  reflection  experiment  to  detect  them.Next,  we  turn  to  undoped  bilayers  hosting  multiple  moire  excitons.  While  prior  work  often  models  these  systems  using  a  Bose-Hubbard  framework,  we  show  that  their  commutation  relations  deviate  from  those  of  conventional  bosons.  Instead,  the  excitons  obey  algebra  similar  to  that  of  angular  momentum  operators,  resulting  in  a  finite  Hilbert  space  and  limiting  local  exciton  occupancy  to  two  or  three,  depending  on  the  bilayer's  specific  parameters.  We  demonstrate  that  this  occupancy  constraint  could  manifest  in  high-intensity  optical  pumping  experiments.Finally,  we  explore  exciton  dynamics  in  a  doped  heterobilayer  where  the  topmost  valence  moire  band  forms  an  antiferromagnetic  Mott  insulator.  We  present  a  theoretical  model  describing  the  coupling  between  the  exciton  and  the  spin  background,  revealing  that  spin  fluctuations  substantially  narrow  the  exciton's  effective  bandwidth-by  orders  of  magnitude  compared  to  its  non-interacting  counterpart.  This  suppression  in  mobility  provides  a  measurable  contrast,  which  we  suggest  can  be  probed  through  exciton  diffusion  experiments.
■590    ▼aSchool  code:  0117.
■650  4▼aCondensed  matter  physics
■650  4▼aOptics
■650  4▼aQuantum  physics
■650  4▼aPhysics
■653    ▼aExcitons
■653    ▼aLight-matter  interaction
■653    ▼aMoire  semiconductors
■653    ▼aStrongly  correlated  electrons
■690    ▼a0611
■690    ▼a0752
■690    ▼a0599
■690    ▼a0605
■71020▼aUniversity  of  Maryland,  College  Park▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0117
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357011▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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