A. Alexandrou, J.A. Kash, et al.
Physical Review B
We have observed a sharp reduction of the photoluminescence linewidth from a two-dimensional exciton system (coupled GaAs/AlGaAs quantum wells), at a certain critical temperature (Tc) and under the influence of an electric field. We attribute this narrowing to a phase transition of the exciton system into an ordered state. The experiments suggest that a coherence length long enough to wash out the effect of the fluctuations, which cause the line broadening, is introduced below Tc. © 1990 The American Physical Society.
A. Alexandrou, J.A. Kash, et al.
Physical Review B
M.R. Freeman, D.D. Awschalom, et al.
Physical Review Letters
L. Via, G.E.W. Bauer, et al.
Physical Review B
E. Mendez, F. Agullã-Rueda, et al.
Physical Review Letters