Volume 81, Number 2, January 2008
Article Number 27003
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 06 December 2007
EPL, 81 (2008) 27003
DOI: 10.1209/0295-5075/81/27003

Large optical gain from four-wave mixing instabilities in semiconductor quantum wells

S. Schumacher, N. H. Kwong and R. Binder

College of Optical Sciences, University of Arizona - Tucson, AZ 85721, USA

received 13 August 2007; accepted in final form 9 November 2007; published January 2008
published online 6 December 2007

Based on a microscopic many-particle theory, we predict large optical gain in the probe and background-free four-wave mixing directions caused by excitonic instabilities in semiconductor quantum wells. For a single quantum well with radiative-decay limited dephasing in a typical pump-probe setup we discuss the microscopic driving mechanisms and polarization and frequency dependence of these instabilities.

71.35.-y - Excitons and related phenomena.
78.47.+p - Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter.
42.65.Sf - Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics.

© EPLA 2008