Physics – Condensed Matter
Scientific paper
1994-04-12
Physics
Condensed Matter
42 pages, 13 figures (available either as ps-files, or as FAX, upon request), RevTex 3.0
Scientific paper
10.1103/PhysRevB.50.5528
We consider a mesoscopic region coupled to two leads under the influence of external time-dependent voltages. The time dependence is coupled to source and drain contacts, the gates controlling the tunnel- barrier heights, or to the gates which define the mesoscopic region. We derive, with the Keldysh nonequilibrium Green function technique, a formal expression for the fully nonlinear, time-dependent current through the system. The analysis admits arbitrary interactions in the mesoscopic region, but the leads are treated as noninteracting. For proportionate coupling to the leads, the time-averaged current is simply the integral between the chemical potentials of the time-averaged density of states, weighted by the coupling to the leads, in close analogy to the time-independent result of Meir and Wingreen (PRL {\bf 68}, 2512 (1992)). Analytical and numerical results for the exactly solvable non-interacting resonant-tunneling system are presented.
Jauho Antti-Pekka
Meir Yigal
Wingreen Ned S.
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