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Charge pumping by electron spin resonance

In the literature electron spin resonance (ESR) has been extensively studied to generate pure spin current without a charge current. In this work we address possible charge pumping by ESR in real space. Using the Keldysh formalism, we present a general charge and spin pumping result induced by rotating magnetic fields applied on a two-terminal device. It was found that when the spatial inversion symmetry of the system is broken, a nonzero charge current can flow in the system besides the spin current. At low frequency, the charge current has a quadratic frequency dependence while the spin current is linear with frequency. In the adiabatic limit, the charge current due to the breaking of spatial symmetry vanishes but the pure spin current still exists. Static disorder can greatly suppress both the pumped charge and the spin current.