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Recombination channels in optically excited graphene
Author(s) -
Jago Roland,
Winzer Torben,
Malic Ermin
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201552425
Subject(s) - excited state , auger effect , graphene , recombination , excitation , atomic physics , materials science , auger , population inversion , dielectric , population , optoelectronics , physics , chemistry , nanotechnology , laser , optics , quantum mechanics , biochemistry , demography , sociology , gene
We present a theoretical study on the efficiency of non‐radiative recombination channels in optically excited graphene on a substrate. We find that depending on the strength of the excitation pulse and the dielectric constant of the applied substrate, either Auger or phonon‐induced recombination prevails. The favorable conditions for Auger recombination are (i) strong excitation regime providing a large number of scattering partners and (ii) low‐dielectric substrates, which only weakly screen the Coulomb interaction. The gained insights are important for achieving a population inversion in graphene that is temporally limited by the presented recombination channels. Carrier recombination channels in optically excited graphene.