Observation of Photoinduced Terahertz Gain in GaAs Quantum Wells: Evidence for Radiative Two-Exciton-to-Biexciton Scattering

Observation of Photoinduced Terahertz Gain in GaAs Quantum Wells: Evidence for Radiative Two-Exciton-to-Biexciton Scattering
X. Li, K. Yoshioka, Q. Zhang, N.M. Peraca, F. Katsutani, W. Gao, G.T. Noe, J.D. Watson, M.J. Manfra, I. Katayama, J. Takeda, and J. Kono. Physical Review Letters [PDF] [Article]