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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
- Analytical chemistry
- 일반주제명
- Atomic physics
- 일반주제명
- Electrical engineering
- 일반주제명
- Mathematics
- 일반주제명
- Optics
- 일반주제명
- Electromagnetics
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2024 us c eng d■001000017360301
■00520260202105503
■006m o d
■007cr#unu||||||||
■020 ▼a9798263325824
■035 ▼a(MiAaPQ)AAI32307963
■035 ▼a(MiAaPQ)GeorgiaTech78551
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a537.5
■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
■690 ▼a0791
■690 ▼a0486
■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.


