Conductance oscillations induced by ballistic snake states in a graphene heterojunction

Abstract

The realization of p-n junctions in graphene, combined with the gapless and chiral nature of its massless Dirac fermions has led to the observation of many intriguing phenomena such as quantum Hall effect in bipolar regime, Klein tunneling, and Fabry-Pérot interferences all of which involve electronic transport across p-n junctions. Ballistic snake states propagating along the p-n junctions have been predicted to induce conductance oscillations, manifesting their twisting nature. However, transport studies along p-n junctions have so far only been performed in low mobility devices. Here, we report the observation of conductance oscillations due to ballistic snake states along a p-n interface in high quality graphene encapsulated by hexagonal boron nitride. These snake states are exceptionally robust as they can propagate over $12$~$\mu$m, limited only by the size of our sample, and survive up to at least $120$~K. The ability to guide carriers over a long distance provide a crucial building block for graphene-based electron optics.

7 pages, 3 figures

References in corpus (21)

• Boron nitride substrates for high-quality graphene electronics
• Chiral tunneling and the Klein paradox in graphene
• Micrometer-scale ballistic transport in encapsulated graphene at room temperature
• STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride
• Andreev reflection and Klein tunneling in graphene
• Quantum interference and Klein tunneling in graphene heterojunctions
• Veselago Lens for Electrons: Focusing and Caustics in Graphene p-n Junctions
• Selective transmission of Dirac electrons and ballistic magnetoresistance of \textit{n-p} junctions in graphene
• Electronic transport and quantum Hall effect in bipolar graphene p-n-p junction
• Klein Backscattering and Fabry-Perot Interference in Graphene Heterojunctions
• Quantized Transport in Graphene p-n Junctions in Magnetic Field
• Gate-controlled Guiding of Electrons in Graphene
• Nonlinear screening and ballistic transport in a graphene p-n junction
• Peculiar Nature of Snake States in Graphene
• Conductance quantization and snake states in graphene magnetic waveguides
• Snake States in Graphene p-n Junctions
• Electronic transport in graphene-based heterostructures
• Landau Level Collapse in Gated Graphene Structures
• Graphene n-p junction in a strong magnetic field: a semiclassical study
• Interplay between snake and quantum edge states in a graphene Hall bar with a pn-junction
• Classical and quantum magneto-oscillations of current flow near a p-n junction in graphene

Cited by in corpus (56)

• Electron optics with ballistic graphene junctions
• A Two-dimensional Dirac fermion microscope
• Mach-Zehnder interferometry using spin- and valley-polarized quantum Hall edge states in graphene
• Guiding of Electrons in a Few Mode Ballistic Graphene Channel
• Electronic materials with nanoscale curved geometries
• Creating and Steering Highly Directional Electron Beams in Graphene
• Gate tuneable beamsplitter in ballistic graphene
• Edge-channel interferometer at the graphene quantum Hall pn junction
• Absorptive pinhole collimators for ballistic Dirac fermions in graphene
• Fabry-Pérot resonances in a graphene/hBN Moiré superlattice
• Snake states and their symmetries in graphene
• Theoretical prediction of a giant anisotropic magnetoresistance in carbon nanoscrolls
• Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe${}_2$
• Imaging ballistic carrier trajectories in graphene using scanning gate microscopy
• Quantized transport, strain-induced perfectly conducting modes and valley filtering on shape-optimized graphene Corbino devices
• Spatial control of laser-induced doping profiles in graphene on hexagonal boron nitride
• Co-existence of classical snake states and Aharanov-Bohm oscillations along graphene p-n junctions
• Aharonov-Bohm interferometer based on n-p junction in graphene nanoribbons
• Giant valley-isospin conductance oscillations in ballistic graphene
• Splitting of conductance resonance through a magnetic quantum dot in graphene
• Large-scale tight-binding simulations of quantum transport in ballistic graphene
• Imaging snake orbits at graphene n-p junctions
• Chiral interface states in graphene $p$-$n$ junctions
• Low Magnetic Field Regime of a Gate-Defined Constriction in High-Mobility Graphene
• Strained graphene Hall bar
• Fabry-Pérot resonances and a crossover to the quantum Hall regime in ballistic graphene quantum point contacts
• Magnetic field oscillations of the critical current in long ballistic graphene Josephson junctions
• Graphene pn-junction in a quantizing magnetic field: Conductance at intermediate disorder strength
• Atomic scale characterization of graphene p-n junctions for electron-optical applications
• Switchable valley filter based on a graphene $p$-$n$ junction in a magnetic field
• Anomalous tunneling characteristic of Weyl semimetals with tilted energy dispersion
• Equilibration of quantum hall edge states and its conductance fluctuations in graphene p-n junctions
• Aharonov-Bohm interferences in polycrystalline graphene
• Boosting energy levels in graphene magnetic quantum dots through magnetic flux and inhomogeneous gap
• Oscillating magnetoresistance in graphene p-n junctions at intermediate magnetic fields
• Veselago focusing of anisotropic massless Dirac fermions
• Understanding magnetic focusing in graphene $p$-$n$ junctions through quantum modeling
• Aharonov-Bohm conductance oscillations and current equilibration in local n - p junctions in graphene
• Interaction-induced conductance from zero modes in a clean magnetic graphene waveguide
• Mode mixing induced by disorder in graphene PNP junction in a magnetic field
• Graphene $n$-$p$ junctions in the Quantum Hall regime: numerical study of incoherent scattering effects
• Point contacts in encapsulated graphene
• Topologically protected wave packets and quantum rings in silicene
• Controllable p$-$n junctions in three$-$dimensional Dirac semimetal Cd${}_3$As${}_2$ nanowires
• Proximity-induced superconductivity in Landau-quantized graphene monolayers
• Magnetic field mediated conductance oscillation in graphene p-n junctions
• Spin inversion in fluorinated graphene n-p junction
• Interplay of filling fraction and coherence in symmetry broken graphene p-n junction
• Spin-orbit interaction and snake states in graphene $p$-$n$ junctions
• Breakdown of the Law of Reflection at a Disordered Graphene Edge
• Persistent currents in topological and trivial confinement in silicene
• Time-dependent transport in Graphene Mach-Zender Interferometers
• Qualitative analysis of magnetic waveguides for two-dimensional Dirac fermions
• Characterization of the size and position of electron-hole puddles at a graphene p-n junction
• Resonant Nonlinear Hall Effect in Two-Dimensional Electron Systems
• Generation, manipulation and detection of snake state trajectories of a neutral atom in a ring-cavity