Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.19: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

Nonequilibrium Dynamics of Nanoscaled Superconductors — •Peter Kettmann¹, Thomas Papenkort¹, Mihail Croitoru², Vollrath Martin Axt², and Tilmann Kuhn¹ — ¹Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Str. 10 — ²Theoretische Physik III, Universität Bayreuth

We theoretically investigate the nonequilibrium dynamics of nanoscaled superconductors. The excitation is achieved by a change of the coupling constant of the electrons. The dynamics are calculated using the Bogoliubov-de Gennes equation for inhomogeneous superconductors. When studying systems that are strongly confined in all three spatial directions we find that the order parameter, the central quantity of the superconductor, oscillates in time. This oscillation consists of many discrete frequencies which mainly correspond to the eigenenergies of the quasiparticles of the system. By increasing the size of the superconductor in one direction we show that the dynamics becomes similar to the one known from the homogeneous case. This is given by a damped oscillation of the order parameter with one collective mode [1]. By using a linear approximation of the equations of motion we show that this behavior can be explained in terms of a sum of independent oscillators dephasing in time.
[1] Papenkort et al., PRB 78, 132505 (2008)