Polariton-polariton interaction constants in microcavities
Abstract
Resonant transmission of light through a microcavity in the strong coupling regime is used to estimate the strength of the interaction between polaritons with parallel (α1) or antiparallel (α2) spins. The ratio α2/α1 is found to be strongly dependent on the detuning between exciton and photon modes. From negative to zero detuning it changes from about 0 to less than -1 . Our observations indicate that at certain conditions the polaritons might rather condense in the real space than form a Bose-Einstein condensate. We analyze theoretically different mechanisms of polariton-polariton interaction including the mean-field electrostatic interaction, the direct exchange interaction, the Van-der-Waals interaction and the indirect exchange interaction via dark exciton and biexciton states.
- Publication:
-
Physical Review B
- Pub Date:
- August 2010
- DOI:
- 10.1103/PhysRevB.82.075301
- Bibcode:
- 2010PhRvB..82g5301V
- Keywords:
-
- 71.36.+c;
- 71.35.Lk;
- Polaritons;
- Collective effects