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Slow Noncollinear Coulomb Scattering in the Vicinity of the Dirac Point in Graphene

J. C. Konig-Otto ; M. Mittendorff ; T. Winzer ; F. Kadi ; Ermin Malic (Institutionen för fysik, Kondenserade materiens teori (Chalmers)) ; A. Knorr ; C. Berger ; W. A. de Heer ; A. Pashkin ; H. Schneider ; M. Helm ; S. Winnerl
Physical Review Letters (0031-9007). Vol. 117 (2016), 8,
[Artikel, refereegranskad vetenskaplig]

The Coulomb scattering dynamics in graphene in energetic proximity to the Dirac point is investigated by polarization resolved pump-probe spectroscopy and microscopic theory. Collinear Coulomb scattering rapidly thermalizes the carrier distribution in k directions pointing radially away from the Dirac point. Our study reveals, however, that, in almost intrinsic graphene, full thermalization in all directions relying on noncollinear scattering is much slower. For low photon energies, carrier-optical-phonon processes are strongly suppressed and Coulomb mediated noncollinear scattering is remarkably slow, namely on a ps time scale. This effect is very promising for infrared and THz devices based on hot carrier effects.

Nyckelord: excited semiconductors, epitaxial graphene, carrier, dynamics, photodetectors, relaxation, generation, detector, Physics, hilp j, 1994, physical review b, v50, p5435

Article Number: 087401

Denna post skapades 2016-09-28.
CPL Pubid: 242478


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