Low Magnetic Field Regime of a Gate-Defined Constriction in High-Mobility Graphene
arXiv:1806.10087 · doi:10.1021/acs.nanolett.8b02584
Abstract
We report on the evolution of the coherent electronic transport through a gate-defined constriction in a high-mobility graphene device from ballistic transport to quantum Hall regime upon increasing the magnetic field. At low field, the conductance exhibits Fabry-Pérot resonances resulting from the npn cavities formed beneath the top-gated regions. Above a critical field corresponding to the cyclotron radius equal to the npn cavity length, Fabry-Pérot resonances vanish and snake trajectories are guided through the constriction with a characteristic set of conductance oscillations. Increasing further the magnetic field allows us to probe the Landau level spectrum in the constriction, with distortions due to the combination of confinement and de-confinement of Landau levels in a saddle potential. These observations are confirmed by numerical calculations.
References in corpus (44)
- The electronic properties of graphene
- Chiral tunneling and the Klein paradox in graphene
- Quantum Transport in Semiconductor Nanostructures
- Quantum interference and Klein tunneling in graphene heterojunctions
- Observation of the Fractional Quantum Hall Effect in Graphene
- Fractional quantum Hall effect and insulating phase of Dirac electrons in graphene
- Observation of the e/3 Fractionally Charged Laughlin Quasiparticles
- Selective transmission of Dirac electrons and ballistic magnetoresistance of \textit{n-p} junctions in graphene
- An Electronic Mach-Zehnder Interferometer
- Transport measurements across a tunable potential barrier in graphene
- Multicomponent fractional quantum Hall effect in graphene
- Klein Backscattering and Fabry-Perot Interference in Graphene Heterojunctions
- Quantum oscillations of the critical current and high-field superconducting proximity in ballistic graphene
- Ballistic interferences in suspended graphene
- Non-Equilibrium Edge Channel Spectroscopy in the Integer Quantum Hall Regime
- Electron quantum optics in ballistic chiral conductors
- Quantized conductance of a suspended graphene nanoconstriction
- Even denominator fractional quantum Hall states at an isospin transition in monolayer graphene
- An On/Off Berry Phase Switch in Circular Graphene Resonators
- Spin and Valley States in Gate-defined Bilayer Graphene Quantum Dots
- Snake Trajectories in Ultraclean Graphene p-n Junctions
- Composite Fermions and Broken Symmetries in Graphene
- Electrostatically induced quantum point contact in bilayer graphene
- A ballistic pn junction in suspended graphene with split bottom gates
- Coupled quantum dots in bilayer graphene
- Conductance oscillations induced by ballistic snake states in a graphene heterojunction
- Snake States in Graphene p-n Junctions
- Size quantization of Dirac fermions in graphene constrictions
- Gate-defined electron-hole double dots in bilayer graphene
- Tuning anti-Klein to Klein tunneling in bilayer graphene
- Quantum and classical confinement of resonant states in a trilayer graphene Fabry-Perot interferometer
- Single- and multi-mode Fabry-Pérot interference in suspended graphene
- Topologically non-trivial valley states in bilayer graphene quantum point contacts
- Landau Level Collapse in Gated Graphene Structures
- Tunable transmission of quantum Hall edge channels with full degeneracy lifting in split-gated graphene devices
- Valley subband splitting in bilayer graphene quantum point contact
- Gate-Defined Graphene Quantum Point Contact in the Quantum Hall Regime
- Theory of carrier density in multigated doped graphene sheets with quantum correction
- Ballistic transport of graphene pnp junctions with embedded local gates
- Co-existence of classical snake states and Aharanov-Bohm oscillations along graphene p-n junctions
- Inter-Edge Backscattering in Buried Split-Gate-Defined Graphene Quantum Point Contacts
- Gate-controlled transmission of quantum Hall edge states in bilayer graphene
- Edge channel confinement in a bilayer graphene -- quantum dot
- Transmission coefficient through a saddle-point electrostatic potential for graphene in the quantum Hall regime
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- Aharonov Bohm Effect in Graphene Fabry Pérot Quantum Hall Interferometers
- A tunable Fabry-Pérot quantum Hall interferometer in graphene
- Dielectric permittivity, conductivity and breakdown field of hexagonal boron nitride
- Graphene-based quantum Hall interferometer with self-aligned side gates
- Fabry-Pérot resonances and a crossover to the quantum Hall regime in ballistic graphene quantum point contacts
- Specular electron focusing between gate-defined quantum point contacts in bilayer graphene
- Interplay of filling fraction and coherence in symmetry broken graphene p-n junction