Nonequilibrium Green function for the photoassisted tunneling in quantum well systems (original) (raw)

Abstract

It is now well known that the transport phenonmena can be treated by the nonequilibrium Green function proposed by Keldysh.(L. V. Keldysh, JEPT 20), 1018 (1965). While the graphic technique of the perturbation method has been well developed, the method of equation of motion has never been applied to nonequilibrium Green functions. On the basis of the Keldysh formalism of perturbation expansion, we derive the equation of motion for the nonequilibrium Green function which incorporates both quantum mechanical and nonequilibrium statistical information. The nonperturbative solution of the equation is obtained self-consistently and is applied to investigate the photoassisted tunneling in quantum well systems with intersubband transtions. The nonequilibrium electron distribution is obtained as a function of time. The time dependent current and its dc component are also calculated. Results from this calculation are presented and discussed.

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