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TT: Tiefe Temperaturen
TT 5: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts - Part 1
TT 5.7: Vortrag
Montag, 27. März 2006, 11:30–11:45, HSZ 304
Adiabatic Pumping through Interacting Quantum Dots — •Janine Splettstoesser1,2, Michele Governale1,2, Jürgen König2, and Rosario Fazio1 — 1Scuola Normale Superiore, Piazza dei Cavalieri, I-56126 Pisa — 2Institut für Theoretische Physik, Ruhr-Universität Bochum, D-44780 Bochum
By periodically changing in time some parameters of a conductor a DC current can be produced without applying a bias voltage. This effect is known as pumping. In case of non-interacting electrons Brouwer’s formula provides a general framework for the computation of the pumped charge [1]. The situation is profoundly different for pumping through interacting systems. In fact, there are only few works that address this problem with methods suited to tackle specific systems/regimes. We present a general formalism to study adiabatic pumping through interacting quantum dots. We derive a formula that relates the pumped charge to the local, instantaneous Green’s function of the dot. This formula is then applied to the infinite-U Anderson model both for weak and strong tunnel-coupling strengths [2].
[1] P. W. Brouwer, Phys. Rev. B 58, R10135 (1998).
[2] J. Splettstoesser, M. Governale, J. König, R.Fazio, cond-mat/0506080 (2005), to be published in PRL.