Spin-Polarization Electronic Transport through a Quantum Dot in the Influence of Microwave Field

The evolution operator method is applied to studying the time-dependent and spin-related electron transport through a quantum dot coupled to two magnetic-metal leads. When the microwave field is applied on quantum dot there are additional peaks of PAT current besides the main peak of resonant tunneling current, and the energy distance between peaks relate to the frequency of microwave fields. Furthermore, Furthermore, owe to the magnetism of lead, the spin-up and spin-down current is different in the parallel magnetization configuration while the same in the antiparallel magnetization configuration.