Ultrafast dynamics and interlayer thermal coupling of hot carriers in epitaxial graphene



We report the first application of nondegenerate ultrafast pump-probe spectroscopy to investigate the dynamics of hot Dirac Fermions in epitaxial graphene. The DT spectra can be understood in terms of the effect of hot thermal carrier distributions on interband transitions with no electron-hole interaction. We also investigate the thermal coupling between carriers of doped and undoped layers. The coupling time is found to be below 500fs. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)