From spatially indirect to momentum-space indirect exciton by in-plane magnetic field

In-plane magnetic field is found to change drastically the photoluminescence spectra and kinetics of interwell excitons in GaAs/AlGaAs coupled quantum wells. The effect is due to the in-plane magnetic field induced displacement of the interwell exciton dispersion in a momentum space, which results in the transition from the momentum-space direct exciton ground state to the momentum-space indirect exciton ground state. In-plane magnetic field is, therefore, an effective tool for the exciton dispersion engineering.

L. V. Butov, A. V. Mintsev, Yu.E. Lozovik, K. L. Campman, A. C. Gossard · 1999