Tuning anti-Klein to Klein tunneling in bilayer graphene

Abstract

We show that in gapped bilayer graphene, quasiparticle tunneling and the corresponding Berry phase can be controlled such that it exhibits features of single layer graphene such as Klein tunneling. The Berry phase is detected by a high-quality Fabry-Pérot interferometer based on bilayer graphene. By raising the Fermi energy of the charge carriers, we find that the Berry phase can be continuously tuned from $2\pi$ down to $0.68\pi$ in gapped bilayer graphene, in contrast to the constant Berry phase of $2\pi$ in pristine bilayer graphene. Particularly, we observe a Berry phase of $\pi$, the standard value for single layer graphene. As the Berry phase decreases, the corresponding transmission probability of charge carriers at normal incidence clearly demonstrates a transition from anti-Klein tunneling to nearly perfect Klein tunneling.

arXiv comment19 pages, 12 figures

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• A Movable Valley Switch Driven by Berry Phase in Bilayer Graphene Resonators
• Berry phase in superconducting multiterminal quantum dots
• Global strain-induced scalar potential in graphene devices
• Engineering THz-frequency light generation, detection and manipulation through graphene
• Andreev reflection in ballistic normal metal/graphene/superconductor junctions
• Anomalous Cyclotron Motion in Graphene Superlattice Cavities
• Low Magnetic Field Regime of a Gate-Defined Constriction in High-Mobility Graphene
• Dirac fermion optics and directed emission from single- and bilayer graphene cavities
• Electronic cloaking of confined states in phosphorene junctions
• Gate-tunable regular and chaotic electron dynamics in ballistic bilayer graphene cavities
• Periodically Gated Bilayer Graphene as an Electronic Metamaterial
• Chirality-2 fermion induced anti-Klein tunneling in 2D checkerboard lattice
• Andreev and normal reflections in gapped bilayer graphene-superconductor junctions
• Characterization of a graphene-hBN superlattice field effect transistor
• Energy distribution controlled ballistic Josephson junction
• Encoding quantum bits in bound electronic states of a graphene nanotorus
• Klein tunneling degradation and enhanced Fabry-Pérot interference in graphene/h-BN moiré-superlattice devices
• Klein tunneling of the electronic states in the gate voltage modulated skyrmion crystal
• Four-band effective square lattice model for Bernal-stacked bilayer graphene
• Perfect transmission of a Dirac particle in one-dimension double square barrier
• Slow interband recombination promotes an anomalous thermoelectric response of the $p-n$ junctions
• Evanescent-mode-assisted Klein tunneling in dual-gated bilayer graphene