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Understanding and Controlling the Magnetic and Optical Properties in Van der Waals Semiconductors
Understanding and Controlling the Magnetic and Optical Properties in Van der Waals Semicon...
Understanding and Controlling the Magnetic and Optical Properties in Van der Waals Semiconductors

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152804
ISBN  
9798384093824
DDC  
530
저자명  
Xie, Kaichen.
서명/저자  
Understanding and Controlling the Magnetic and Optical Properties in Van der Waals Semiconductors
발행사항  
[Sl] : University of Washington, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
92 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Cao, Ting.
학위논문주기  
Thesis (Ph.D.)--University of Washington, 2024.
초록/해제  
요약Within the broad spectrum of two-dimensional (2D) materials, 2D van der Waals (vdW) magnetic semiconductors are distinguished by their novel properties, which stem from the weak yet tunable interlayer magnetic interactions, adding an entirely new magnetic degree of freedom to vdW interfacial engineering. In this dissertation, we discuss the understanding and prediction of the magnetic and optical properties of vdW magnetic semiconductors employing ab initio methods alongside other theoretical and computational techniques. This dissertation is organized as follows:In Chapter 1, we provide a brief introduction to the theoretical and computational methods that compute the quasiparticle and exciton properties of materials, and the recent advancements in the field of 2D magnetic semiconductors.In Chapter 2, we focus on exploring the magneto-excitonic coupling in a prototypical 2D vdW magnet CrSBr utilizing ab initio calculations. We uncover the anisotropic Wannier nature of the 2D excitons in few-layer CrSBr and the entanglement of excitons between vdW layers of this material.In Chapter 3, we present several mechanical approaches to harnessing the power of magneto-electronic coupling in 2D vdW magnet CrSBr. Our qualitative analysis attributes the effects of these mechanical tuning knobs on magnetic properties to subtle alterations in bond geometry.In Chapter 4, we investigate the intriguing potential for manipulating magnetic phases in 2D magnets through interfacial charge transfer in heterostructures of magnetic and nonmagnetic layers.4 We unveil a transition towards the ferromagnetic phase by stacking antiferromagnetic bilayer CrSBr on graphene and by electrostatic doping. We further demonstrate that the phase transition is a spin-canting process.In Chapter 5, we establish a theoretical framework to investigate the ultrafast optical control of excitonic structures. We demonstrate coherent optical field as a powerful tool to manipulate the excitonic properties in 2D materials. From our calculations, we find that the dark and bright excitons can be coherently coupled, resulting in novel absorption features as a function of frequency.
일반주제명  
Condensed matter physics
일반주제명  
Materials science
일반주제명  
Electromagnetics
일반주제명  
Physical chemistry
키워드  
Two-dimensional materials
키워드  
Magnetic semiconductors
키워드  
Excitonic structures
키워드  
Magneto-electronic coupling
키워드  
Graphene heterostructure
기타저자  
University of Washington Materials Science and Engineering
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

 008250123s2024        us                              c    eng  d
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■006m          o    d                
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■020    ▼a9798384093824
■035    ▼a(MiAaPQ)AAI31556908
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aXie,  Kaichen.
■24510▼aUnderstanding  and  Controlling  the  Magnetic  and  Optical  Properties  in  Van  der  Waals  Semiconductors
■260    ▼a[Sl]▼bUniversity  of  Washington▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a92  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Cao,  Ting.
■5021  ▼aThesis  (Ph.D.)--University  of  Washington,  2024.
■520    ▼aWithin  the  broad  spectrum  of  two-dimensional  (2D)  materials,  2D  van  der  Waals  (vdW)  magnetic  semiconductors  are  distinguished  by  their  novel  properties,  which  stem  from  the  weak  yet  tunable  interlayer  magnetic  interactions,  adding  an  entirely  new  magnetic  degree  of  freedom  to  vdW  interfacial  engineering.  In  this  dissertation,  we  discuss  the  understanding  and  prediction  of  the  magnetic  and  optical  properties  of  vdW  magnetic  semiconductors  employing  ab  initio  methods  alongside  other  theoretical  and  computational  techniques.  This  dissertation  is  organized  as  follows:In  Chapter  1,  we  provide  a  brief  introduction  to  the  theoretical  and  computational  methods  that  compute  the  quasiparticle  and  exciton  properties  of  materials,  and  the  recent  advancements  in  the  field  of  2D  magnetic  semiconductors.In  Chapter  2,  we  focus  on  exploring  the  magneto-excitonic  coupling  in  a  prototypical  2D  vdW  magnet  CrSBr  utilizing  ab  initio  calculations.  We  uncover  the  anisotropic  Wannier  nature  of  the  2D  excitons  in  few-layer  CrSBr  and  the  entanglement  of  excitons  between  vdW  layers  of  this  material.In  Chapter  3,  we  present  several  mechanical  approaches  to  harnessing  the  power  of  magneto-electronic  coupling  in  2D  vdW  magnet  CrSBr.  Our  qualitative  analysis  attributes  the  effects  of  these  mechanical  tuning  knobs  on  magnetic  properties  to  subtle  alterations  in  bond  geometry.In  Chapter  4,  we  investigate  the  intriguing  potential  for  manipulating  magnetic  phases  in  2D  magnets  through  interfacial  charge  transfer  in  heterostructures  of  magnetic  and  nonmagnetic  layers.4  We  unveil  a  transition  towards  the  ferromagnetic  phase  by  stacking  antiferromagnetic  bilayer  CrSBr  on  graphene  and  by  electrostatic  doping.  We  further  demonstrate  that  the  phase  transition  is  a  spin-canting  process.In  Chapter  5,  we  establish  a  theoretical  framework  to  investigate  the  ultrafast  optical  control  of  excitonic  structures.  We  demonstrate  coherent  optical  field  as  a  powerful  tool  to  manipulate  the  excitonic  properties  in  2D  materials.  From  our  calculations,  we  find  that  the  dark  and  bright  excitons  can  be  coherently  coupled,  resulting  in  novel  absorption  features  as  a  function  of  frequency.
■590    ▼aSchool  code:  0250.
■650  4▼aCondensed  matter  physics
■650  4▼aMaterials  science
■650  4▼aElectromagnetics
■650  4▼aPhysical  chemistry
■653    ▼aTwo-dimensional  materials
■653    ▼aMagnetic  semiconductors
■653    ▼aExcitonic  structures
■653    ▼aMagneto-electronic  coupling
■653    ▼aGraphene  heterostructure
■690    ▼a0794
■690    ▼a0611
■690    ▼a0607
■690    ▼a0494
■71020▼aUniversity  of  Washington▼bMaterials  Science  and  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0250
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163872▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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