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21 February 2011 Electron relaxation in metals and high-Tc superconductors on the 10-fs timescale
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Abstract
We perform two-colour pump probe experiments on metals and superconductors using synchronized 10-fs pulses generated by optical parametric amplifiers, tunable from the visible to the near-infrared, mapping with unprecedented detail the energy equilibration dynamics of the free electron gas. In gold films we observe dramatic changes of the differential reflectivity spectrum on the 100-fs timescale, corresponding to the establishment of the thermal electron distribution, with dynamics dictated by excess energy. In high-Tc cuprate superconductors we observe fast electron relaxation, attributed to a strong electron-phonon coupling which may play a role in the superconductivity mechanism.
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D. Brida, C. Gadermaier, D. Polli, V. V. Kabanov, D. Mihailovic, and G. Cerullo "Electron relaxation in metals and high-Tc superconductors on the 10-fs timescale", Proc. SPIE 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV, 79371P (21 February 2011); https://doi.org/10.1117/12.876856
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