Abstract
We investigate the real-time dynamics of spin current pumped from a quantum dot driven by pulsed magnetic resonance. Based on the nonequilibrium Green's function formalism, we obtain an exact solution to the time-dependent spin current occurring in such nonstationary situations. Performing numerical calculations, we demonstrate that a Rabi oscillation is exhibited in the transient spin current at the resonance, while the spin current eventually reaches its time-independent stationary value after a prolonged excitation. The spin current response in the time domain correlates directly to the time evolution of the spin state in the dot, suggesting the possibility of real-time spin measurement via pumped spin current.
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