Effect of the depolarization field on coherent optical properties in semiconductor quantum dots
Abstract
We study the photon echo spectrum of self-assembled semiconductor quantum dots using femtosecond light pulses. The spectrum shape changes from a single-peaked to a double-peaked structure as the time delay between the two excitation pulses is increased. The spectrum change is reproduced by numerical calculations, which include the depolarization field induced by the biexciton-exciton transition as well as the conventional local-field effect for the exciton-ground-state transition in a quantum dot. Our findings suggest that various optical transitions in tightly localized systems generate a depolarization field, which renormalizes the resonant frequency with a change in the polarization itself, leading to unique optical properties.
- Publication:
-
Physical Review B
- Pub Date:
- June 2018
- DOI:
- 10.1103/PhysRevB.97.235305
- Bibcode:
- 2018PhRvB..97w5305M