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Papenkort, Thomas ; Kuhn, Tilmann ; Axt, Vollrath Martin:
Nonequilibrium dynamics and coherent control of BCS superconductors driven by ultrashort THz pulses.
In: Journal of Physics: Conference Series.
Bd. 193
(2009)
Heft 1
.
- 012050.
ISSN 1742-6596
DOI: https://doi.org/10.1088/1742-6596/193/1/012050
Abstract
The nonequilibrium dynamics of BCS superconductors after excitation with short THz pulses slightly above the superconducting gap is studied theoretically. Calculated pump-probe spectra show how the gap is influenced by this optical excitation. For ultrashort pump pulses a nonadiabatic regime emerges, in which the BCS order parameter exhibits oscillations. These oscillations do not show up in pump-probe spectra. However they may be made visible by using a coherent control type excitation with two phase-locked pump pulses.