Antiresonance in the spin current through a quantum dot induced by electron-phonon interaction

We investigate the nonequilibrium spin transport through an electron-phonon coupled quantum dot, on which an external magnetic field B-0 and a rotating magnetic field [B-1 cos(omega(1)t), B-1 sin(omega(1)t )] are applied. It is found that the spin current is significantly affected by the destructive interference between electron tunneling waves through different spin channels. As a result, dips appear in the spin current as a function of omega(1 )every time the Rabi frequency is tuned to be integral numbers of the phonon frequency. It is also found that the main spin current peak does not always exist at the resonant rotating frequency omega(1)= g mu B-B(0).