Imaging backscattering in graphene quantum point contacts
arXiv:1704.08460 · doi:10.1103/PhysRevB.96.165310
Abstract
We study graphene quantum point contacts (QPC) and imaging of the backscattering of the Fermi level wave function by potential introduced by a scanning probe. We consider both etched single-layer QPCs as well as the ones formed by bilayer patches deposited at the sides of the monolayer conducting channel using an atomistic tight binding approach. A computational method is developed to effectively simulate an infinite graphene plane outside the QPC using a computational box of a finite size. We demonstrate that in spite of the Klein phenomenon interference due to the backscattering at a circular n-p junction induced by the probe potential is visible in spatial maps of conductance as functions of the probe position.
8 pages, 14 figures
References in corpus (24)
- The electronic properties of graphene
- Chiral tunneling and the Klein paradox in graphene
- Biased bilayer graphene: semiconductor with a gap tunable by electric field effect
- Asymmetry gap in the electronic band structure of bilayer graphene
- Graphene field-effect-transistors with high on/off current ratio and large transport band gap at room temperature
- Quantum interference and Klein tunneling in graphene heterojunctions
- The electronic properties of bilayer graphene
- Veselago Lens for Electrons: Focusing and Caustics in Graphene p-n Junctions
- Klein Backscattering and Fabry-Perot Interference in Graphene Heterojunctions
- Conductance Quantization in Graphene Nanoribbons
- Coherent transport in graphene nanoconstrictions
- Quantized conductance of a suspended graphene nanoconstriction
- Caustics due to Negative Refractive Index in Circular Graphene p-n Junctions
- Contact resistance and shot noise in graphene transistors
- On the imaging of electron transport in semiconductor quantum structures by scanning-gate microscopy: successes and limitations
- Size quantization of Dirac fermions in graphene constrictions
- Spin-orbit coupling in fluorinated graphene
- Electron interferometer formed with a scanning probe tip and quantum point contact
- Imaging Electron Interferometer
- Interference features in scanning gate conductance maps of quantum point contacts with disorder
- Quantum Hall Effect and Quantum Point Contact in Bilayer-Patched Epitaxial Graphene
- Electron flow in circular graphene quantum dots
- Imaging snake orbits at graphene n-p junctions
- Scanning gate microscopy of magnetic focusing in graphene devices: quantum vs. classical simulation
Cited by in corpus (7)
- Imaging Dirac fermions flow through a circular Veselago lens
- Theory of scanning gate microscopy imaging of the supercurrent distribution in a planar Josephson junction
- Scanning gate microscopy mapping of edge current and branched electron flow in a transition metal dichalcogenide nanoribbon and quantum point contact
- Scanning gate microscopy in graphene nanostructures
- Scanning gate microscopy of nonretracing electron-hole trajectories in a normal-superconductor junction
- Imaging signatures of the local density of states in an electronic cavity
- Signatures of Majorana bound states in scanning gate microscopy of hybrid nanowires