Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 26: Transport - Poster Session
TT 26.13: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Transport properties of a single electron transistor strongly coupled to a nanomechanical resonator — •Charles Doiron1, Wolfgang Belzig2, and Christoph Bruder1 — 1Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland — 2Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
It is now experimentally possible to create nanometer-sized mechanical resonators and to couple them to quantum point contacts or single electron transistor (SET) to study their behaviour.
Previous theoretical studies of the coupled nanomechanical resonator-SET system have focused on the regime where the coupling between the resonator and the SET is weak. In this regime the electrons tunneling trough the SET act like an effective thermal bath, effectively damping the motion of the oscillator [1]. Until now, the strong coupling regime has not been investigated theoretically.
In this work, we use a master-equation approach to describe the coupled SET-nanomechanical resonator system in the strong coupling regime. We compute the dynamics of the resonator as well as the effect of the coupling on the current and noise characteristics of the SET.
[1]A. D. Armour, M. P. Blencowe, and Y. Zhang, Phys. Rev. B 69, 125313 (2004)