Ultrafast low-energy dynamics of graphite studied by nonlinear multi-THz spectroscopy
1 Department of Physics and Center for Applied Photonics, University of Konstanz, Universitätsstr. 10, 78464 Konstanz, Germany
2 IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
3 Department of Physics, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany,
Ultraintense few-cycle THz pulses are employed to study the nonlinear response of graphite. A phase sensitive 2D spectroscopy setup is capable of detecting pump-induced transient changes as well as multi-wave mixing processes. The observed strong THz-pump THz-probe signals provide insight into ultrafast dynamics and the spectral response of the low-energy carriers. Here we report the observation of a pump-induced transmission in graphite. The relaxation dynamics shows three distinct time scales, which are assigned to carrier thermalization, phonon emission and a slow cooling down back to equilibrium.
© Owned by the authors, published by EDP Sciences, 2013
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