Transport properties of bilayer graphene in a strong in-plane magnetic field

Abstract

A strong in-plane magnetic field drastically alters the low-energy spectrum of bilayer graphene by separating the parabolic energy dispersion into two linear Dirac cones. The effect of this dramatic change on the transport properties strongly depends on the orientation of the in-plane magnetic field with respect to the propagation direction of the charge carriers and the angle at which they impinge on the electrostatic potentials. For magnetic fields oriented parallel to the potential boundaries an additional propagating mode that results from the splitting into Dirac cones enhances the transmission probability for charge carriers tunneling through the potentials and increases the corresponding conductance. Our results show that the chiral suppression of transmission at normal incidence is turned into a chiral enhancement when the magnetic field increases, thus indicating a transition from a bilayer to a monolayer-like system at normal incidence. Further, we find that the typical transmission resonances stemming from confinement in a potential barrier are shifted to higher energy and are eventually transformed into anti-resonances with increasing magnetic field. For magnetic fields oriented perpendicular to the potential boundaries we find a very pronounced transition from a bilayer system to two separated monolayer-like systems with Klein tunneling emerging at certain incident angles symmetric around 0, which also leaves a signature in the conductance. For both orientations of the magnetic field, the transmission probability is still correctly described by pseudospin conservation. Finally, to motivate the large in-plane magnetic field, we show that its energy spectrum can be mimicked by specific lattice deformations such as a relative shift of one of the layers. With this equivalence we introduce the notion of an in-plane pseudo-magnetic field.

13 pages, 11 figures

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• The electronic properties of graphene
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• Quantum interference and Klein tunneling in graphene heterojunctions
• The electronic properties of bilayer graphene
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• Ballistic transmission through a graphene bilayer
• Energy spectrum of graphene multilayers in a parallel magnetic field

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• Solitons induced by an in-plane magnetic field in rhombohedral multilayer graphene
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• Spin waves in doped graphene: a time-dependent spin-density-functional approach to collective excitations in paramagnetic two-dimensional Dirac fermion gases
• Barrier tunneling of the Loop-Nodal Semimetal in the Hyperhoneycomb lattice
• Klein tunneling in deformed honeycomb-dice lattice: from massless to massive particles
• Engineering of Chern number of topological bands in bilayer graphene by in-plane magnetic field and electrical bias
• Magic-angle twisted bilayer graphene under orthogonal and in-plane magnetic fields
• Mode-selective cloaking and phase-matching cavity resonances in bilayer graphene transport
• Mode-Resolved Multiband Ballistic Transport and Conductance Thresholds in Bilayer Graphene Junctions
• Insulator-Metal Transition and Magnetic Crossover in Bilayer Graphene