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Magneto-Infrared Spectroscopy on Zrte5 and Non-Polar Epitaxial Graphene
Magneto-Infrared Spectroscopy on Zrte5 and Non-Polar Epitaxial Graphene
Magneto-Infrared Spectroscopy on Zrte5 and Non-Polar Epitaxial Graphene

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105503
ISBN  
9798263325824
DDC  
537.5
저자명  
Zhao, Tianhao.
서명/저자  
Magneto-Infrared Spectroscopy on Zrte5 and Non-Polar Epitaxial Graphene
발행사항  
[Sl] : Georgia Institute of Technology, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
121 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Jiang, Zhigang.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
초록/해제  
요약In this thesis, we use magneto-infrared spectroscopy to study zirconium pentatelluride (ZrTe5) and non-polar epitaxial graphene. ZrTe5 is a three-dimensional topological material residing near the boundary of the Strong Topological Insulator (STI) and Weak Topological Insulator (WTI) phases. By fitting the data to k · p model, we find the band parameters of ZrTe5 strongly anisotropic along its three principal axes. We identify two sets of Landau Level (LL) transitions in the low-temperature magneto spectra, which signifies a second extremum in the band structure resulting from the band inversion. We conclude the material to be in the STI phase in the low-temperature range. Temperature-dependent measurements are also performed on ZrTe5, and the massive Dirac model is used to fit the data. We find that the band gap has a monotonic increasing behavior to the temperature. We explain the observation with a Topological Phase Transition (TPT) scenario without band gap closing. In the second part of the thesis, non-polar epigraphene is grown on the non-polar facet of silicon carbide. In its magneto spectra, We observe Monolayer Graphene (MLG) behavior with band parameters consistent with previously reported epigraphene. Besides that, peak splittings at high magnetic fields are observed. We attribute it to the LL splitting effect in the Twisted Bilayer Graphene (TBLG) when the energy is above van Hove's singularity. We fit the data with the continuum model and extract the information on the twist angle and the interlayer coupling.
일반주제명  
Electrons
일반주제명  
Spectrum analysis
일반주제명  
Fourier transforms
일반주제명  
Semiconductors
일반주제명  
Electromagnetism
일반주제명  
Magnetic fields
일반주제명  
Symmetry
일반주제명  
Phase transitions
일반주제명  
Energy
일반주제명  
Graphene
일반주제명  
Transistors
일반주제명  
Atoms & subatomic particles
일반주제명  
Analytical chemistry
일반주제명  
Atomic physics
일반주제명  
Electrical engineering
일반주제명  
Mathematics
일반주제명  
Optics
일반주제명  
Electromagnetics
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aZhao,  Tianhao.
■24510▼aMagneto-Infrared  Spectroscopy  on  Zrte5  and  Non-Polar  Epitaxial  Graphene
■260    ▼a[Sl]▼bGeorgia  Institute  of  Technology▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a121  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  B.
■500    ▼aAdvisor:  Jiang,  Zhigang.
■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2024.
■520    ▼aIn  this  thesis,  we  use  magneto-infrared  spectroscopy  to  study  zirconium  pentatelluride  (ZrTe5)  and  non-polar  epitaxial  graphene.  ZrTe5  is  a  three-dimensional  topological  material  residing  near  the  boundary  of  the  Strong  Topological  Insulator  (STI)  and  Weak  Topological  Insulator  (WTI)  phases.  By  fitting  the  data  to  k  ·  p  model,  we  find  the  band  parameters  of  ZrTe5  strongly  anisotropic  along  its  three  principal  axes.  We  identify  two  sets  of  Landau  Level  (LL)  transitions  in  the  low-temperature  magneto  spectra,  which  signifies  a  second  extremum  in  the  band  structure  resulting  from  the  band  inversion.  We  conclude  the  material  to  be  in  the  STI  phase  in  the  low-temperature  range.  Temperature-dependent  measurements  are  also  performed  on  ZrTe5,  and  the  massive  Dirac  model  is  used  to  fit  the  data.  We  find  that  the  band  gap  has  a  monotonic  increasing  behavior  to  the  temperature.  We  explain  the  observation  with  a  Topological  Phase  Transition  (TPT)  scenario  without  band  gap  closing.  In  the  second  part  of  the  thesis,  non-polar  epigraphene  is  grown  on  the  non-polar  facet  of  silicon  carbide.  In  its  magneto  spectra,  We  observe  Monolayer  Graphene  (MLG)  behavior  with  band  parameters  consistent  with  previously  reported  epigraphene.  Besides  that,  peak  splittings  at  high  magnetic  fields  are  observed.  We  attribute  it  to  the  LL  splitting  effect  in  the  Twisted  Bilayer  Graphene  (TBLG)  when  the  energy  is  above  van  Hove's  singularity.  We  fit  the  data  with  the  continuum  model  and  extract  the  information  on  the  twist  angle  and  the  interlayer  coupling.
■590    ▼aSchool  code:  0078.
■650  4▼aElectrons
■650  4▼aSpectrum  analysis
■650  4▼aFourier  transforms
■650  4▼aSemiconductors
■650  4▼aElectromagnetism
■650  4▼aMagnetic  fields
■650  4▼aSymmetry
■650  4▼aPhase  transitions
■650  4▼aEnergy
■650  4▼aGraphene
■650  4▼aTransistors
■650  4▼aAtoms  &  subatomic  particles
■650  4▼aAnalytical  chemistry
■650  4▼aAtomic  physics
■650  4▼aElectrical  engineering
■650  4▼aMathematics
■650  4▼aOptics
■650  4▼aElectromagnetics
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■690    ▼a0748
■690    ▼a0544
■690    ▼a0405
■690    ▼a0752
■690    ▼a0607
■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
■790    ▼a0078
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360301▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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