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Atomic to Wafer-Scale Imaging and Control of Two Dimensional Quantum Materials
Atomic to Wafer-Scale Imaging and Control of Two Dimensional Quantum Materials
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260209102916
- ISBN
- 9798265429360
- DDC
- 546.73
- 서명/저자
- Atomic to Wafer-Scale Imaging and Control of Two Dimensional Quantum Materials
- 발행사항
- [Sl] : Stanford University, 2023
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- 형태사항
- 150 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Manoharan, Hari;Suzuki, Yuri.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2023.
- 초록/해제
- 요약Two-dimensional quantum materials have emerged as a class of growing interest for their potential in technological applications and as platforms for exploring new physics. Access and control of atomic-scale features of these materials is critical to understanding their behavior at device and wafer scales. Scanning tunneling microscopy and spectroscopy (STM/STS) provide powerful tools to both locally measure and locally control the electronic properties of these materials. This thesis explores the connection between atomic-scale features, including those locally manipulated by STM, and wafer-scale characteristics of two distinct two-dimensional electronic systems. First, we demonstrate that the Cu(111) surface state under wafer-scale hBN is homogeneous in energy and spectral weight over nanometer length scales and across atomic terraces. In contrast, a new spectral feature, not seen on bare Cu(111), varies with atomic registry and shares the spatial periodicity of the hBN/Cu(111) moire pattern. This demonstrates that, for some 2D electron systems, an hBN overlayer can act as a protective yet remarkably transparent window on fragile low-energy electronic structure below.The second system 1 will discuss is magnetically active manganese atoms in molybdenum disulfide (Mn-MoS2), a system which theory has suggested could behave as a two-dimensional dilute magnetic semiconductor, with implications for spintronics applications and novel ground states. Local gating with the STM tip allows for identification and control of the charge and magnetic state of individual Mn atoms, enabling an understanding of bulk paramagnetic behavior observed with Kerr rotation experiments over centimeter-size samples. These experiments show that single Mn atoms in MoS2 function as active unscreened magnetic moments in the monolayer, and can be harnessed for spin physics applications and science. The third material, sodium cobaltate, hosts a half-metallic surface state. Using a superconducting STM tip, superconductivity can be introduced into the surface state via the proximity effect, producing interesting point contact spectroscopy features including a zero-bias peak suggestive of a Majorana mode. By comparison with models of chiral p-wave superconductivity it is shown that it is likely that the superconductivity induced into this surface state is topologically non-trivial.Lastly, a characterization of the surface and subsurface defects on cleaved Weyl semi-metal tungsten ditelluride is performed. It is shown that defects in this material affect the electronic structure at the Fermi level over several nanometers, and that even subsurface defects not visible in topography of the surface act as scattering centers for the surface electrons. This has important implications for the study of superconductivity induced into the topological surface state of this material.
- 일반주제명
- Boron
- 일반주제명
- Electrons
- 일반주제명
- Superconductivity
- 일반주제명
- Spectrum analysis
- 일반주제명
- Fourier transforms
- 일반주제명
- Single crystals
- 일반주제명
- Sodium
- 일반주제명
- Molybdenum
- 일반주제명
- Microscopy
- 일반주제명
- Copper
- 일반주제명
- Energy
- 일반주제명
- Transistors
- 일반주제명
- Analytical chemistry
- 일반주제명
- Atomic physics
- 일반주제명
- Electrical engineering
- 일반주제명
- Mathematics
- 일반주제명
- Optics
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260203s2023 us c eng d■001000017366023
■00520260209102916
■006m o d
■007cr#unu||||||||
■020 ▼a9798265429360
■035 ▼a(MiAaPQ)AAI32316456
■035 ▼a(MiAaPQ)Stanfordhr993zm0396
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a546.73
■1001 ▼aZerger, Caleb Zamora.
■24510▼aAtomic to Wafer-Scale Imaging and Control of Two Dimensional Quantum Materials
■260 ▼a[Sl]▼bStanford University▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a150 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Manoharan, Hari;Suzuki, Yuri.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2023.
■520 ▼aTwo-dimensional quantum materials have emerged as a class of growing interest for their potential in technological applications and as platforms for exploring new physics. Access and control of atomic-scale features of these materials is critical to understanding their behavior at device and wafer scales. Scanning tunneling microscopy and spectroscopy (STM/STS) provide powerful tools to both locally measure and locally control the electronic properties of these materials. This thesis explores the connection between atomic-scale features, including those locally manipulated by STM, and wafer-scale characteristics of two distinct two-dimensional electronic systems. First, we demonstrate that the Cu(111) surface state under wafer-scale hBN is homogeneous in energy and spectral weight over nanometer length scales and across atomic terraces. In contrast, a new spectral feature, not seen on bare Cu(111), varies with atomic registry and shares the spatial periodicity of the hBN/Cu(111) moire pattern. This demonstrates that, for some 2D electron systems, an hBN overlayer can act as a protective yet remarkably transparent window on fragile low-energy electronic structure below.The second system 1 will discuss is magnetically active manganese atoms in molybdenum disulfide (Mn-MoS2), a system which theory has suggested could behave as a two-dimensional dilute magnetic semiconductor, with implications for spintronics applications and novel ground states. Local gating with the STM tip allows for identification and control of the charge and magnetic state of individual Mn atoms, enabling an understanding of bulk paramagnetic behavior observed with Kerr rotation experiments over centimeter-size samples. These experiments show that single Mn atoms in MoS2 function as active unscreened magnetic moments in the monolayer, and can be harnessed for spin physics applications and science. The third material, sodium cobaltate, hosts a half-metallic surface state. Using a superconducting STM tip, superconductivity can be introduced into the surface state via the proximity effect, producing interesting point contact spectroscopy features including a zero-bias peak suggestive of a Majorana mode. By comparison with models of chiral p-wave superconductivity it is shown that it is likely that the superconductivity induced into this surface state is topologically non-trivial.Lastly, a characterization of the surface and subsurface defects on cleaved Weyl semi-metal tungsten ditelluride is performed. It is shown that defects in this material affect the electronic structure at the Fermi level over several nanometers, and that even subsurface defects not visible in topography of the surface act as scattering centers for the surface electrons. This has important implications for the study of superconductivity induced into the topological surface state of this material.
■590 ▼aSchool code: 0212.
■650 4▼aBoron
■650 4▼aElectrons
■650 4▼aSuperconductivity
■650 4▼aSpectrum analysis
■650 4▼aFourier transforms
■650 4▼aSingle crystals
■650 4▼aSodium
■650 4▼aMolybdenum
■650 4▼aMicroscopy
■650 4▼aCopper
■650 4▼aEnergy
■650 4▼aTransistors
■650 4▼aAnalytical chemistry
■650 4▼aAtomic physics
■650 4▼aElectrical engineering
■650 4▼aMathematics
■650 4▼aOptics
■690 ▼a0791
■690 ▼a0486
■690 ▼a0748
■690 ▼a0544
■690 ▼a0405
■690 ▼a0752
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17366023▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


