Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Postersession Transport: Nanoelectronics, Quantum Coherence and Quantum Information, Fluctuations and Noise

TT 35.1: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

Interference and interaction effects in adiabatic pumping through quantum dots — •Bastian Hiltscher, Michele Governale, and Jürgen König — Theoretische Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany

In order to investigate the effects of interference and interaction in adiabatic pumping, we consider an Aharonov-Bohm (AB) interferometer with a quantum dot embedded either in one or in both arms[1]. We employ a real-time formalism and we perform an expansion both in the tunnel-coupling strengths between dot and leads and in the pumping frequency[2], taking into account the Coulomb interaction non perturbatively.

We find that pumping in the AB interferometer with only one dot has a peristaltic but at the same time phase-coherent character. The flux dependence of the pumped current clearly indicates the presence of coherent processes in this transport mechanism. In an AB interferometer with one dot in each arm, it is possible to pump with the gate voltages of the two different dots. In this case, pumping relies purely on quantum-mechanical interference and has no classical counterpart.

[1] J. König und Y. Gefen, Phys. Rev. B 65, 045316 (2002).

[2] J. Splettstoesser, M. Governale, J. König, and R. Fazio, Phys. Rev. B 74, 085305 (2006).