Phys. Rev. B 72, 193304 (2005) [4 pages]Transient response of photoexcited electrons: Negative and oscillating currentReceived 29 July 2005; revised 7 September 2005; published 9 November 2005 The time-dependent current of the electrons excited in the conduction band after ultrafast interband photogeneration is studied theoretically. The transient photocurrent is calculated for the nonlinear regime of response to a stationary electric field. The response demonstrates transient absolute negative conductivity when the electrons are excited slightly below the optical phonon energy, while the periodic oscillations of the electric current appear after formation of the streaming distribution. The quenching of these peculiarities by the elastic scattering of electrons is also considered. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.193304
DOI:
10.1103/PhysRevB.72.193304
PACS:
72.40.+w, 72.10.−d, 72.20.Ht
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