Two-dimensional electronic transport at the bare KTaO₃ (100) single crystals by laser irradiation

The structure and electrical properties of KTaO₃ (100) single crystals through the laser irradiation have been systematically investigated. The KTaO₃ single crystals after irradiation exhibit the two-dimensional conductivity, which is confirmed by the anisotropic magnetoresistance. The Hall measurements show that carrier density and mobility can reach 10¹⁴ cm⁻² and 110 cm²/ Vs at 20 K by laser irradiation, respectively. Analysis indicates that there is a transition region between amorphous layer and crystalline layer, where the electron transfer accounts for the metallic conductivity. This is the joint effect of the laser-induced oxygen defect and the surface destruction of lattice. Our results provide a novel way to study and fabricate all-oxide devices.