Magnetic field mediated conductance oscillation in graphene p-n junctions
arXiv:1805.03859 · doi:10.1088/1361-648X/aab5e1
Abstract
The electronic transport of graphene p-n junctions under perpendicular magnetic field is investigated in theory. Under low magnetic field, the transport is determined by the resonant tunneling of Landau levels and conductance versus magnetic field shows a Shubnikov-de Haas oscillation. At higher magnetic field, the p-n junction subjected to the quasi-classical regime and the formation of snake states results in periodical backscattering and transmission as magnetic field varies. The conductance oscillation pattern is mediated both by magnetic field and the carrier concentration on bipolar regions. For medium magnetic field between above two regimes, the combined contributions of resonant tunneling, snake states oscillation and Aharanov-Bohm interference induce irregular oscillation of conductance. At very high magnetic field, the system is subjected to quantum Hall regime. Under disorder, the quantum tunneling at low magnetic field is slightly affected and the oscillation of snake states at higher magnetic field is suppressed. In the quantum Hall regime, the conductance is a constant as predicted by the mixture rule.
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References in corpus (22)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- Boron nitride substrates for high-quality graphene electronics
- Chiral tunneling and the Klein paradox 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
- Evidence of Klein tunneling in graphene p-n junctions
- Quantized Transport in Graphene p-n Junctions in Magnetic Field
- Electronic Highways in Bilayer Graphene
- Disorder-induced enhancement of transport through graphene p-n junctions
- Snake Trajectories in Ultraclean Graphene p-n Junctions
- Scalable Tight-Binding Model for Graphene
- Snake States in Graphene p-n Junctions
- Zero Landau level in folded graphene nanoribbons
- Disorder Effects in the Quantum Hall Effect of Graphene p-n Junctions
- Universal quantized spin-Hall conductance fluctuation in graphene
- Reversal of thermoelectric current in tubular nanowires
- Giant valley-isospin conductance oscillations in ballistic graphene
- Interplay between snake and quantum edge states in a graphene Hall bar with a pn-junction
- Graphene pn-junction in a quantizing magnetic field: Conductance at intermediate disorder strength
- Mode mixing induced by disorder in graphene PNP junction in a magnetic field