Photoinduced metallic Volkov-Pankratov states in a semi-Dirac material

We study the interfacial modes across the interface between the two regions of a semi -Dirac type material, which are illuminated by the left and right circularly polarized light, respectively. We show that a smooth boundary between the two regions give rise to a momentum dependent P & ouml;& ouml;schl-Teller potential well which hosts the metallic and gapless Volkov-Pankratov states. We also note that incident electron can fully pass over the interfacial well without any reflection only at certain light parameters-known as the Ramsauer-Townsend effect. Moreover, we also observe that such modes can even exist across the interface between the irradiated and nonirradiated regions under certain condition.