Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00258 : Photoluminescence from hydrogenated graphene
Author:
We consider the optical properties of hydrogenated graphene as
a function of hydrogen concentration between the graphene and
graphane limits. In particular, we show that with increasing
hydrogen concentration the gap in the electron density of
states grows from 0 to approximately 5eV in the case of
graphane. For intermediate concentrations, additional
electronic states with energies smaller than 5eV appear. These
states make the system optically active in the visible range.
We pay special attention to the possibility of ultrafast
photoluminescence in the system for different values of
hydrogen concentration and hole doping. For example, for
excitations by ultrafast laser pulses, the system demonstrates
significant visible range photoluminescence driven by the
electron-phonon interaction. In the case of graphane, the
effect can be significantly enhanced by hole doping, when the
phonon spectrum demonstrates a Kohn anomaly, which results in a
faster partial equilibration between the electrons and an
optical phonon subsystem.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.258
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