Transmission in Graphene through Tilted Barrier in Laser Field

Abstract

The transmission of Dirac fermions in graphene through a tilted barrier potential in the presence of a laser field of frequency 𝝎 is studied. By using Floquet theory, the Dirac equation is solved and then the energy spectrum is obtained. The boundary conditions together with the transfer matrix method allow to determine the transmission probabilities corresponding to all energy bands E + lℏ𝝎 (l = 0, ±1, …). By limiting to the central band l = 0 and the two first side bands l = ±1, it is shown that the transmissions are strongly affected by the laser field and barrier. Indeed, it is found that the Klein effect is still present, a variety of oscillations are inside the barrier, and there is essentially no transmission across all bands.

Transmission in graphene through a double laser barrier

“…Notably, increasing the intensity of the laser field has been demonstrated to effectively diminish overall transmission [31,32]. In a related context, it has been observed that irradiating graphene subjected to an inclined potential barrier results in null transmission [33], leading to the complete confinement of fermions. This phenomenon is identified as anti-Klein tunneling.…”