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Nanoscale Imaging of Ballistic and Viscous Electronic Transport in Graphene
Nanoscale Imaging of Ballistic and Viscous Electronic Transport in Graphene
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104801
- ISBN
- 9798288832642
- DDC
- 620.11
- 서명/저자
- Nanoscale Imaging of Ballistic and Viscous Electronic Transport in Graphene
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 95 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Brar, Victor W.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
- 초록/해제
- 요약Ballistic and hydrodynamic electron flow can develop in materials when carrier momentum is conserved over long distance and time scales. These non-Ohmic transport regimes are characterized by distinctive spatial distributions of the current density and electrochemical potential. In this thesis, I will show scanning tunneling potentiometry (STP) measurements of the electrochemical potential induced by DC transport in graphene as a function of carrier density, temperature, and magnetic field. First, STP images are recorded as current flows through electrostatic constrictions with gate-tunable width that are "drawn" with the STM tip. The electrochemical potential drop through these constrictions determines the wavevector-dependent conductivity σ(k) of the electron fluid. Upon heating the system from 4.5 K to 77 K, enhanced electron-electron scattering leads to a crossover from ballistic to hydrodynamic flow, identified by superballistic conductance through the constrictions and a suppression of Landauer residual-resistivity dipoles. When increasing the magnetic field from 0 to 1.4 T at 4.5 K, the STP data reveals a diffusive-to-ballistic crossover in the flow of current resulting from Landau level quantization. In the ballistic regime of magnetotransport, the local Hall field is enhanced one cyclotron diameter away from scattering surfaces.
- 일반주제명
- Materials science
- 일반주제명
- Applied physics
- 일반주제명
- Physics
- 키워드
- Ballistic regime
- 키워드
- Graphene
- 키워드
- Transport
- 기타저자
- The University of Wisconsin - Madison Physics
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202104801
■006m o d
■007cr#unu||||||||
■020 ▼a9798288832642
■035 ▼a(MiAaPQ)AAI32164588
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620.11
■1001 ▼aKrebs, Zachary Joseph.
■24510▼aNanoscale Imaging of Ballistic and Viscous Electronic Transport in Graphene
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a95 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Brar, Victor W.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
■520 ▼aBallistic and hydrodynamic electron flow can develop in materials when carrier momentum is conserved over long distance and time scales. These non-Ohmic transport regimes are characterized by distinctive spatial distributions of the current density and electrochemical potential. In this thesis, I will show scanning tunneling potentiometry (STP) measurements of the electrochemical potential induced by DC transport in graphene as a function of carrier density, temperature, and magnetic field. First, STP images are recorded as current flows through electrostatic constrictions with gate-tunable width that are "drawn" with the STM tip. The electrochemical potential drop through these constrictions determines the wavevector-dependent conductivity σ(k) of the electron fluid. Upon heating the system from 4.5 K to 77 K, enhanced electron-electron scattering leads to a crossover from ballistic to hydrodynamic flow, identified by superballistic conductance through the constrictions and a suppression of Landauer residual-resistivity dipoles. When increasing the magnetic field from 0 to 1.4 T at 4.5 K, the STP data reveals a diffusive-to-ballistic crossover in the flow of current resulting from Landau level quantization. In the ballistic regime of magnetotransport, the local Hall field is enhanced one cyclotron diameter away from scattering surfaces.
■590 ▼aSchool code: 0262.
■650 4▼aMaterials science
■650 4▼aApplied physics
■650 4▼aPhysics
■653 ▼aBallistic regime
■653 ▼aGraphene
■653 ▼aHydrodynamic flow
■653 ▼aScanning tunneling potentiometry
■653 ▼aTransport
■690 ▼a0794
■690 ▼a0215
■690 ▼a0605
■71020▼aThe University of Wisconsin - Madison▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358857▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
