Tunneling current and conductance of optically tunable Dirac particles with elliptical dispersion

Based on earlier-obtained electron transmission, we have calculated the tunneling conductance and the current over a square potential barrier for both graphene and an α-T3 lattice under a linearly polarized off-resonant dressing field. The tunneling current is calculated using the transmission coefficient. Applying a dressing field with linear polarization leads to an anisotropy in the electron energy dispersion. Consequently, the circular cross section of the Dirac cone becomes elliptical. The major axis of this ellipse is not necessarily aligned with the direction of electron head-on collisions with the potential barrier. This misalignment leads to asymmetric Klein tunneling. We demonstrate that the tunneling conductance exhibits unexpected properties due to the longitudinal component of the electron group velocity not being equivalent to the longitudinal momentum.