Chiral tunneling through a time-periodic potential in monolayer graphene

Abstract

Chiral tunneling through a harmonically driven potential barrier in a graphene monolayer is considered in this work. Since the charge carriers in this system are massless, chiral Dirac particles, tunneling is described as Klein tunneling and is highly anisotropic. To study Klein tunneling through a harmonically driven potential barrier, we determine the transmission probabilities for the central band and sidebands as the incident angle of the electron beam is changed. Furthermore, we investigate the transmission probabilities as the width, amplitude, and frequency of the oscillating barrier are changed. Interestingly, perfect transmission for normal incidence that has been reported for a static barrier persists for the oscillating barrier which is a manifestation of Klein tunneling in a time-harmonic potential.