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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
Atomic to Wafer-Scale Imaging and Control of Two Dimensional Quantum Materials

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260209102916
ISBN  
9798265429360
DDC  
546.73
저자명  
Zerger, Caleb Zamora.
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

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■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.

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