Low-frequency excitation of double quantum dots

Details Low-frequency excitation of double quantum dots Low-frequency excitation of double quantum dots

2008-09-04

arxiv.org/abs/0809.0900v1

Proc. SPIE 7142, 714206 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figs, invited paper for AOMD-6, to appear in SPIE Proceedings

Scientific paper

10.1117/12.816583

We address theoretically adiabatic regime of charge transport for a model of two tunnel-coupled quantum dots connected in series. The energy levels of the two dots are harmonically modulated by an external potential with a constant phase shift between the two. Motivated by recent experiments with surface-acoustic-wave excitation, we consider two situations: (a) pure pumping in the absence of external voltage (also at finite temperature), and (b) adiabatic modulation of the current driven by large external bias. In both cases we derive results consistent with published experimental data. For the case (b) we explicitly derive the adiabatic limit of Tien-Gordon formula for photon-assisted tunneling and compare it to the outcome of simple conductance modulation. A tutorial for adiabatic pumping current calculations with the Green function formalism is included.

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