Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: TR: Fluctuations and Noise

TT 26.3: Vortrag

Dienstag, 15. März 2011, 14:45–15:00, HSZ 301

Semiclassical dynamics of a NEMS oscillator — •Anja Metelmann and Tobias Brandes — Institut für Theoretische Physik, TU Berlin, Hardenbergstr. 36, Berlin D-10623, Germany

We investigate the dynamics of a single phonon (oscillator) mode linearly coupled to an electronic few–level system in contact with external particle reservoirs (leads). A stationary electronic current through the system generates non–trivial dynamical behaviour of the oscillator [1]. Using Feynman–Vernon influence functional theory, we derive a Langevin equation for the oscillator trajectory that is non–perturbative in the system–leads coupling. For the case of two coupled electronic levels, we discuss various regimes of the oscillator dynamics.

[1] R. Hussein, A. Metelmann, P. Zedler, and T. Brandes, Phys. Rev. B 82, 165406 (2010).