Spin-dependent transport through an interacting quantum dot system

Using an equation of motion technique, we report on a theoretical analysis of transport characteristics of a spin-valve system formed by a quantum dot coupled to ferromagnetic leads, whose magnetic moments are oriented at an angle \theta with respect to each other, and a mesoscopic ring by the Anderson Hamiltonian. We analyse the density of states of this system, and our results reveal that the density of states show some noticeable characteristics depending on the relative angle \theta of magnetic moment M, and the spin-polarised strength P in ferromagnetic leads, and also the magnetic flux \varPhi and the number of lattice sites N_R in the mesoscopic ring. These effects might have some potential applications in spintronics.