Quantum interference and Klein tunneling in graphene heterojunctions

Abstract

The observation of quantum conductance oscillations in mesoscopic systems has traditionally required the confinement of the carriers to a phase space of reduced dimensionality. While electron optics such as lensing and focusing have been demonstrated experimentally, building a collimated electron interferometer in two unconfined dimensions has remained a challenge due to the difficulty of creating electrostatic barriers that are sharp on the order of the electron wavelength. Here, we report the observation of conductance oscillations in extremely narrow graphene heterostructures where a resonant cavity is formed between two electrostatically created bipolar junctions. Analysis of the oscillations confirms that p-n junctions have a collimating effect on ballistically transmitted carriers. The phase shift observed in the conductance fringes at low magnetic fields is a signature of the perfect transmission of carriers normally incident on the junctions and thus constitutes a direct experimental observation of ``Klein Tunneling.''

13 pages and 6 figures including supplementary information. The paper has been modified in light of new theoretical results available at arXiv:0808.0488

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• Fabry-Pérot interference in 2D low-density Rashba gas
• Hofstadter butterflies in magnetically modulated graphene bilayer: an algebraic approach
• Theory of ballistic quantum transport in presence of localized defects
• Spin Relaxation in Weak Localization Regime in Multilayer Graphene Spin Valves
• RFSoC-based radio-frequency reflectometry in gate-defined bilayer graphene quantum devices
• Geometric interference in a high-mobility graphene annulus p-n junction device
• Klein tunneling of the electronic states in the gate voltage modulated skyrmion crystal
• Electronic response of graphene to linelike charge perturbations
• Signature of nodal topology in nonlinear quantum transport across junctions in Weyl and multi-Weyl semimetals
• Intervalley quantum interference and measurement of Berry phase in bilayer graphene
• Engineering superconducting contacts transparent to a bipolar graphene
• Subgap modes in two-dimensional magnetic Josephson junctions
• Tracing Dirac points of topological surface states by ferromagnetic resonance
• Conductance oscillation in surface junctions of Weyl semimetals
• Spin and valley polarized one-way Klein tunneling in photonic topological insulators
• Experimental Observation of Bound States of 2D Dirac Electrons at Surface Steps of the Topological Insulator Bi${}_2$Se${}_3$
• Eigenfrequencies of the randomly pinned drum and conductivity of graphene
• Quantum Charged Spinning Massless Particles in 2+1 dimensions
• Valley to charge current conversion in graphene grain boundaries
• Time-dependent transport in Graphene Mach-Zender Interferometers
• Tunable spectral narrowing enabling the functionality of graphene qubit circuits at room temperature
• Strong equilibration of Landau levels edge-states at the graphene edge
• Klein Tunneling of Gigahertz Elastic Waves in Nanoelectromechanical Metamaterials
• Signature of topological phases in Zitterbewegung
• Electronic analogue of Fourier optics with mass-less Dirac fermions scattered by quantum dot lattice
• Transport properties in ABC-ABA-ABC trilayer graphene junctions
• Unconventional transport properties in systems with triply degenerate quadratic band crossings
• Charging graphene nanoribbon quantum dots
• Competition-Induced Sign Reversal of Casimir-Lifshitz Torque: An Investigation on Topological Node-Line Semimetal
• Edge channels in a graphene Fabry-Perot interferometer
• Fabry-Perot and Aharonov-Bohm interference in ideal graphene nanoribbons
• Ferrotronics for the creation of band gaps in Graphene
• Klein tunneling in deformed honeycomb-dice lattice: from massless to massive particles
• High Crystallinity and Decoupling of Graphene on a Metal: Reduced Coulomb Screening and Tunable pn-Junctions
• Spontaneous twisting and shrinking of carbon nanotubes
• Dynamically assisted Klein tunneling in the Furry picture
• Observation of angle-dependent transmission of Dirac electrons in graphene hetero junctions
• Quantum interference effects on the noise power in the CNT/aGNR/CNT junction
• Perfect transmission of a Dirac particle in one-dimension double square barrier
• Classical Propagation in the Quantum Inverted Oscillator
• Quasi-${\Phi }_0$-periodic supercurrent at quantum Hall transitions
• Mode-selective cloaking and phase-matching cavity resonances in bilayer graphene transport
• Massive Dirac-Pauli physics in lead-halide perovskites
• 'Guided' Fractures in Graphene Mechanical Diode-like Structures
• Scattering Dynamics and Boundary States of a Non-Hermitian Dirac Equation
• Massive Klein Tunneling in Topological Photonic Crystals
• Zero-energy states in graphene quantum dot with wedge disclination
• Evanescent-mode-assisted Klein tunneling in dual-gated bilayer graphene
• Access to Klein Tunneling via Space-Time Modulation
• Strain- and potential-controlled tunneling in monolayer MoS${}_2$
• Quantum-Hall Spectroscopy of Elliptically Deformed Graphene Nanobubble Qubits
• Scanning tunneling microscope characterizations of a circular graphene resonator realized with p-p junctions
• Anisotropic tunneling through magnetic barriers in 8-Pmmn borophene
• Ballistic dynamics of Dirac particles in electro-magnetic fields
• Coherent-scatterer enhancement and Klein-tunneling suppression by potential barriers in gapped graphene with chirality-time-reversal symmetry
• Graphene tests of Klein phenomena
• Klein tunneling of light in fiber Bragg gratings
• Transmission and Goos-Hänchen like Shifts through a Graphene Double Barrier in an Inhomogeneous Magnetic Field
• Coupling of Klein-Andreev Resonant States in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$-graphene-Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$ Devices
• Klein tunneling through triple barrier in AB bilayer graphene
• Electron-hole Hybridization in Bilayer Graphene
• Electronic confinement of surface states in a topological insulator nanowire
• Quantum transport of pseudospin-polarized Dirac fermions in gapped graphene nanostructures
• Super-Klein tunneling of Klein-Gordon particles
• Observation of Dirac cone warping and chirality effects in silicene
• Nonlinear Conductivity in Graphene
• Pseudospin-one particles in the time-periodic dice lattice: A new approach to transport control
• Magnetically modulated superconductor-graphene-superconductor (SGS) Josephson junctions and their tunability
• Fabry-Pérot cavities and quantum dot formation at gate-defined interfaces in twisted double bilayer graphene