Open AccessUltrafast dynamics and interlayer thermal coupling of hot carriers in epitaxial graphene
Author(s) -
Sun Dong,
Wu ZongKwei,
Divin Charles,
Li Xuebin,
Berger Claire,
Heer Walt A. de,
First Phillip N.,
Norris Theodore B.
Publication year - 2009
Publication title -
physica status solidi c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 46
eISSN - 1610-1642
pISSN - 1862-6351
DOI - 10.1002/pssc.200880359
Subject(s) - ultrashort pulse , graphene , coupling (piping) , dirac fermion , thermal , epitaxy , materials science , fermion , condensed matter physics , dirac (video compression format) , spectroscopy , doping , spectral line , electron , chemical physics , nanotechnology , physics , optoelectronics , optics , quantum mechanics , thermodynamics , laser , layer (electronics) , neutrino , metallurgy
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)