Chiral tunneling through time-periodic potential in graphene

TL;DR

This paper studies how electrons tunnel through a time-periodic potential barrier in graphene, revealing that Klein tunneling persists even with oscillating barriers and analyzing how various parameters affect transmission.

Contribution

It introduces a detailed analysis of chiral tunneling in graphene with a harmonically driven potential, highlighting the persistence of Klein tunneling under dynamic conditions.

Findings

Perfect transmission at normal incidence persists with oscillating barriers.

Transmission probabilities depend on barrier width, amplitude, and frequency.

Chiral nature causes highly anisotropic tunneling behavior.

Abstract

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.