Electromagnetic field induced suppression of transport through $n$-$p$ junctions in graphene

Abstract

We study quasi-particle transmission through an $n$-$p$ junction in a graphene irradiated by an electromagnetic field (EF). In the absence of EF the electronic spectrum of undoped graphene is gapless, and one may expect the perfect transmission of quasi-particles flowing perpendicular to the junction. We demonstrate that the resonant interaction of propagating quasi-particles with the component of EF parallel to the junction induces a \textit{non-equilibrium dynamic gap} $(2{\Delta }_R)$ between electron and hole bands in the quasi-particle spectrum of graphene. In this case the strongly suppressed quasi-particle transmission is only possible due to interband tunnelling. The effect may be used for controlling transport properties of diverse structures in graphene, like, e.g., $n$-$p$-$n$ transistors, single electron transistors, quantum dots, etc., by variation of the intensity $S$ and frequency $\omega$ of the external radiation.

5 pages, 3 figures

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• Dynamical Floquet spectrum of Kekulé-distorted graphene under normal incidence of electromagnetic radiation
• Scattering of two-dimensional Dirac fermions on gate-defined oscillating quantum dots
• Quantum Hall effect in ac driven graphene: from half-integer to integer case
• Transmission in strained graphene subjected to laser and magnetic fields
• Radiation-induced quantum Fano-type resonances in the transport of $N$-$P$-$N$ graphene based junctions
• Modulating dichroism and optical conductivity in bilayer graphene under intense electromagnetic field irradiation
• Photon-assisted spin transport in a two-dimensional electron gas
• Tuned gap in graphene through laser barrier
• Floquet Control of Electron and Exciton Transport in Kekulé-Distorted Graphene
• Transmissions in gapped graphene exposed to tilting and oscillating barriers