Transmission in strained graphene subjected to laser and magnetic fields

TL;DR

This paper analyzes how strain along different directions affects electron transmission in graphene under magnetic and electromagnetic fields, revealing directional differences in oscillations and tunneling suppression.

Contribution

It provides an analytical study of strain effects on transmission probabilities in graphene using Floquet theory and transfer matrix methods, highlighting directional dependencies.

Findings

Transmission oscillations decrease at zero strain with barrier width and energy.

Strain increases sideband transmission oscillations in zigzag direction.

Klein tunneling suppression occurs at normal incidence across strains.

Abstract

We investigate the effect of strain along armchair and zigzag directions on electrical transport in graphene through a magnetic barrier and a linearly polarized electromagnetic wave. In the context of Floquet theory, the eigenvalues and related eigenspinors are calculated analytically. The transmission probabilities are expressed as a function of different parameters using the transfer matrix approach and boundary conditions at two interfaces with current densities. We see that as the barrier width and incident energy change, the transmission via the center band oscillates less at zero strain. The transmission across the first sidebands begins at 0 and follows the pattern of a sinusoidal function that grows with increasing barrier width and becomes nearly linear for larger incident energy. When the strain magnitude is activated, the number of oscillations in all transmission channels drops marginally in the armchair direction but increases dramatically in the zigzag direction. The behavior of the total transmission is found to be comparable to that of the central band, with the exception that it exhibits a translation to the up. The suppression of Klein tunneling at normal incidence is another result seen in all strain settings.