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Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.10: Poster

Friday, March 4, 2005, 14:00–18:00, Poster TU C

Electron transport in metallic multi-island geometries: Coulomb blockade and quantum fluctuations — •Björn Kubala1, Göran Johansson2, and Jürgen König11Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany — 2MC2, Chalmers University of Technology, S-412 96 Göteborg, Sweden

Experiments on coupled single-electron transistors investigate, how charging effects on one island are modified by capacitive and tunnel coupling to other islands [1]. We developed a method to study electron transport through such systems, driven by finite thermal or voltage bias. Based on real-time transport theory [2], all diagrams up to second order in tunneling coupling are automatically generated and evaluated. This computational approach captures all different sequential and cotunneling processes.

In particular, we find a class of cotunneling processes involving correlated tunneling onto two different islands. These can be linked to tunneling rates for an SET in a noisy environment -constituted by another SET- as calculated within a P(E) theory. We will discuss applications to different setups and strength and limitations of our method.

[1] R. Schäfer et al., cond-mat/0205223; Physica E 18, 87, (2003); K. W. Lehnert et al., Phys. Rev. Lett. 91, 106801 (2003).

[2] H. Schoeller and G. Schön, Phys. Rev. B 50, 18 436 (1994); J. König, H. Schoeller, and G. Schön, Phys. Rev. Lett. 78, 4482 (1997).

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