Low-frequency excitation of double quantum dots

Abstract

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.

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

References in corpus (11)

• Electron transport through double quantum dots
• Scattering approach to parametric pumping
• The Statistical Theory of Quantum Dots
• Floquet scattering theory of quantum pumps
• Time-dependent resonant tunneling via two discrete states
• Adiabatic transport in nanostructures
• Nonadiabatic Electron Pumping: Maximal Current with Minimal Noise
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Cited by in corpus (3)

• Thermoelectric performance of a driven double quantum dot
• Charge and spin pumping through a double quantum dot
• Interaction-induced charge and spin pumping through a quantum dot at finite bias