Nonequilibrium transport and population inversion in double quantum dot systems

Details Nonequilibrium transport and population inversion in double quantum dot systems Nonequilibrium transport and population inversion in double quantum dot systems

1996-11-26

arxiv.org/abs/cond-mat/9611199v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages, RevTex. 3 Figures included, to be published in Int. J. Mod. Phys. B

Scientific paper

10.1142/S0217979297000745

We present a microscopic theory for both equilibrium and nonequilibrium transport properties of coupled double quantum dots (DQD). A general formula for current tunneling through the DQD is derived by the nonequilibrium Green's function method. Using a Hartree-Fock approach, effects of multi-level coupling and nonequilibrium electron distributions in resonant tunneling are considered. We find that the peak in the resonant tunneling current through two symmetric dots will split only when the inter-dot coupling is stronger than dot-lead coupling. We predict that population inversion can be achieved in one dot in the nonequilibrium regime.

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