Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 48: Graphene: Dynamics
O 48.7: Talk
Wednesday, March 18, 2015, 12:00–12:15, MA 041
Non-equilibrium Carrier Relaxation in Graphene investigated with tr-ARPES — •Mariana Chavez Cervantes1, Raghu Tomar1, Hubertus Bromberger1, Haiyun Liu1, Stefan Link2, Ulrich Starke2, Andrea Cavalleri1,3, and Isabella Gierz1 — 1Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany — 3Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, United Kingdom
We used time- and angle-resolved photoemission spectroscopy (tr-ARPES) based on high order harmonics generation for the extreme ultra-violet (XUV) probe to investigate the relaxation of photo-excited carriers in quasi-freestanding epitaxial graphene samples. From the data we determined the energy dependence of the scattering rate that, according to Ref. [1,2], is predicted to follow the imaginary part of the equilibrium self-energy. In order to test this hypothesis we compare the scattering rate measured at different sample temperatures and for different pump fluences with the equilibrium self-energy determined from high-resolution static ARPES experiments as described in Ref. [3,4].
M. Sentef et al., Phys. Rev. X 3, 041033 (2013)
[2] A. F. Kemper et al., Phys. Rev. B 90, 075126 (2014)
[3] A. Bostwick et al., Nat. Phys. 3, 36 (2007)
[4] I. Gierz et al., Faraday Disc. 171 (1), 311 (2014)