Transport properties in gapped graphene through magnetic barrier in a laser field

TL;DR

This paper investigates how a laser field influences electron transport in gapped graphene with a magnetic barrier, revealing that photon exchange activates transmission and that incident angle and energy gap significantly impact conductance.

Contribution

It introduces a detailed analysis of photon-assisted transport in gapped graphene under laser irradiation using Floquet theory and transfer matrix methods.

Findings

Laser field activates photon exchange in electron transmission.

Transmission depends strongly on incident angle and energy gap.

Conductance increases with higher electron transmission through the barrier.

Abstract

We study the transport properties of Dirac fermions through gapped graphene through a magnetic barrier irradiated by a laser field oscillating in time. We use Floquet theory and the solution of Weber's differential equation to determine the energy spectrum corresponding to the three regions composing the system. The boundary conditions and the transfer matrix approach {are} employed to explicitly determine the transmission probabilities for multi-energy bands and the associated conductance. As an illustration, we focus only on the three first bands: the central band $T_0$ (zero photon exchange) and the two first side bands $T_{\pm1}$ (photon emission or absorption). It is found that the laser field activates the process of translation through photon exchange. Furthermore, we show that varying the incident angle and energy gap strongly affects the transmission process. The conductance increases when the number of electrons that cross the barrier increases, namely when there is a significant transmission.