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Current enhancement due to field-induced dark carrier multiplication in graphene

Roland Jago (Institutionen för fysik, Kondenserade materiens teori (Chalmers)) ; F. Wendler ; Ermin Malic (Institutionen för fysik, Kondenserade materiens teori (Chalmers))
2d Materials (2053-1583). Vol. 4 (2017), 2,
[Artikel, refereegranskad vetenskaplig]

We present a microscopic study on current generation in graphene in response to an electric field. While scattering is generally considered to reduce the current, we reveal that in graphene Auger processes give rise to a current enhancement via a phenomenon we denote dark carrier multiplication. Based on a microscopic approach, we show that, if other scattering channels are absent, this prevents the carrier distribution to reach a stationary value. Taking into account scattering with phonons a finite current is restored, however its value exceeds the stationary current without scattering.

Nyckelord: graphene, electric field, carrier dynamics, semiconductor Bloch equations, carrier multiplication

Denna post skapades 2017-07-20.
CPL Pubid: 250758


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