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Collective free-carrier scattering in semiconductors

Robb, G.R.M. and McNeil, B.W.J. and Galbraith, I. and Jaroszynski, D.A. (2001) Collective free-carrier scattering in semiconductors. Physical Review B: Condensed Matter and Materials Physics, 63 (16). pp. 165208-165211. ISSN 1098-0121

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Abstract

We present an analysis of an undoped semiconductor strongly pumped by a coherent electromagnetic radiation field. The free-carrier dynamics and the incident and scattered fields are described classically and self-consistently. The analysis predicts the existence of a collective instability which simultaneously generates a strong free-carrier grating along the propagation direction and a coherently backscattered radiation field. An example is given showing scattered intensities approaching 100% of the pump intensity. A realistic experiment to enable observation of this phenomenon is described.