Abstract
Using time-resolved picosecond photoluminescence, the effects of magnetic field on the dynamics of two-dimensional heavy-hole excitons have been studied in a high-quality quantum well. Fitting the experimental results to the four-level dynamical model revealed that an increase in magnetic field resulted in (1) a decrease of the exciton radiative lifetime due to the combined effect of the magnetic-field-induced lateral shrinking of the exciton wave function and simultaneous expansion of its coherence area, as well as (2) an increase of the energy relaxation time for the optically excited carriers due to the formation of a quasi-zero-dimensional electronic density of states. Both effects have been predicted theoretically, but neither has been observed experimentally so far.
- Received 14 September 1995
DOI:https://doi.org/10.1103/PhysRevB.52.17430
©1995 American Physical Society