Capacitive Effects of Gate on Spin-Dependent AC Transport

From the spin-spin interaction, spin-capacitive term is defined in a similar way to the usual charge capacitive term that is due to the charge-charge interaction. The charge and spin capacitive effects between the gate and central channel region are found to play an important role in gate-controlled spin-dependent transport systems. Both the capacitive terms affect system´s charge and spin ac transport properties. The behaviors of conductance, density of states, and internal potentials demonstrate the strong involvement of charge and spin in electrons in spin-dependent transport. The purpose of this paper is to draw attention to the Coulomb and exchange interactions in spintronics devices.