Photocurrent in a visible-light graphene photodiode

Abstract

We calculate the photocurrent in a clean graphene sample normally irradiated by a monochromatic electromagnetic field and subject to a step-like electrostatic potential. We consider the photon energies $\hslash \Omega$ that significantly exceed the height of the potential barrier, as is the case in the recent experiments with graphene-based photodetectors. The photocurrent comes from the resonant absorption of photons by electrons and decreases with increasing ratio $\hslash \Omega /U_0$. It is weakly affected by the background gate voltage and depends on the light polarization as $\propto {\sin }^2\gamma$, $\gamma$ being the angle between the potential and the polarization plane.

5 pages, 3 figures

References in corpus (3)

• Graphene photodetectors for high-speed optical communications
• Photovoltaic Hall effect in graphene
• Effect of radiation on transport in graphene

Cited by in corpus (1)

• Relativistic graphene ratchet on semidisk Galton board