Effect of radiation on transport in graphene
arXiv:0804.3571 · doi:10.1103/PhysRevB.78.045407
Abstract
We study transport properties of graphene-based p-n junctions irradiated by an electromagnetic field (EF). The resonant interaction of propagating quasiparticles with an external monochromatic radiation opens dynamical gaps in their spectrum, resulting in a strong modification of current-voltage characteristics of the junctions. The values of the gaps are proportional to the amplitude of EF. We find that the transmission of the quasiparticles in the junctions is determined by the tunneling through the gaps, and can be fully suppressed when applying a sufficiently large radiation power. However, EF can not only suppress the current but also generate it. We demonstrate that if the height of the potential barrier exceeds a half of the photon energy, the directed current (photocurrent) flows through the junction without any dc bias voltage applied. Such a photocurrent arises as a result of inelastic quasiparticle tunneling assisted by one- or two-photon absorption. We calculate current-voltage characteristics of diverse graphene based junctions and estimate their parameters necessary for the experimental observation of the photocurrent and transmission suppression.
21 pages, 15 figures
References in corpus (17)
- Electric Field Effect in Atomically Thin Carbon Films
- Ultrahigh electron mobility in suspended graphene
- Chiral tunneling and the Klein paradox in graphene
- Electrochemically Top Gated Graphene: Monitoring Dopants by Raman Scattering
- Giant Intrinsic Carrier Mobilities in Graphene and Its Bilayer
- Graphene Nano-Ribbon Electronics
- A Graphene Field-Effect Device
- Selective transmission of Dirac electrons and ballistic magnetoresistance of \textit{n-p} junctions in graphene
- Transport measurements across a tunable potential barrier in graphene
- Electronic transport and quantum Hall effect in bipolar graphene p-n-p junction
- Effect of Disorder on Transport in Graphene
- Two Dimensional Electron and Hole Gases at the Surface of Graphite
- Effect of electron-electron interactions on the conductivity of clean graphene
- Nonlinear screening and ballistic transport in a graphene p-n junction
- Effect of disorder on a graphene p-n junction
- Electromagnetic field induced suppression of transport through - junctions in graphene
- Photon-assisted spin transport in a two-dimensional electron gas