45 research outputs found
Photocurrent in a visible-light graphene photodiode
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 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 . It is weakly affected by the background
gate voltage and depends on the light polarization as ,
being the angle between the potential and the polarization plane.Comment: 5 pages, 3 figure