Chiral tunneling through time-periodic potential in graphene
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Chiral tunneling through a harmonically driven potential barrier in graphene monolayer is considered in this work. Since the quasiparticles in this system are chiral in nature, tunneling is highly anisotropic, we determine the transmission probabilities for the central and sidebands as the incident angle of the electron beam is changed . Furthermore, we investigate how the transmission probabilities change as the width, amplitude and frequency of the oscillating barrier is changed. An interesting result of our study is that perfect transmission for normal incidence that has been reported for a static barrier persists for the oscillating barrier, manifestation of Klein tunneling in a time harmonic potential.
submitted in PRB; 17 pages, discussion of bilayer replaced with further analytical results for monolayer
submitted in PRB; 17 pages, discussion of bilayer replaced with further analytical results for monolayer