فهرست نشریات علمی دسترسی آزاد ایران

An extended theoretical study to investigated the role of laser field in spintronic properties through quantum dot embedded between two normal leads is introduced. The Anderson model is used in our treatment to model the quantum dot energy level that hybridize with the leads to enable the spintronic tunneling process. An external magnetic field, the intra-dot Coulomb correlation on quantum dot and their coupling with the leads are incorporates in this study. The calculations declare that if the laser field is applied on quantum dot, a multiple transport channels are opened. Each spin energy level of quantum dot splits to three spin energy levels, resulting in the occurrence of the photon-assisted (FAT) peaks in total differential conductance spectrum. The positions of these peaks related to the peaks in differential conductance spectrum of the channels. An interesting result is the observation of photon-assisted (FAT) peak that can be generated in the Coulomb blockade effect around (VSb  = 0) region, which is belong to one of the three opened channels in this region, depending on manipulating and tuning of the energy level of quantum dot and the external magnetic field. This peak clarifies that the linear behaviors of spin current and the device behave as resistor in this region. This feature can be utilized experimentally to estimate the behavior the spin current, differential conductance and their opened channels with spin bias variation, depending on the energy level of quantum and the external magnetic field measuring.