Mutual coupling of two semiconductor quantum dots via an optical nanocavity
Abstract
We present an experimental and theoretical study of a system consisting of two spatially separated self-assembled InGaAs quantum dots strongly coupled to a single optical nanocavity mode. Due to their different size and compositional profiles, the two quantum dots exhibit markedly different dc Stark shifts. This allows us to tune them into mutual resonance with each other and a photonic crystal nanocavity mode as a bias voltage is varied. Photoluminescence measurements show a characteristic triple peak during the double anticrossing, which is a clear signature of a coherently coupled system of three quantum states. We fit the entire set of emission spectra of the coupled system to theory and are able to investigate the coupling between the two quantum dots via the cavity mode, and the coupling between the two quantum dots when they are detuned from the cavity mode. We suggest that the resulting quantum V-system may be advantageous since dephasing due to incoherent losses from the cavity mode can be avoided.
- Publication:
-
Physical Review B
- Pub Date:
- August 2010
- DOI:
- 10.1103/PhysRevB.82.075305
- arXiv:
- arXiv:0912.3685
- Bibcode:
- 2010PhRvB..82g5305L
- Keywords:
-
- 78.67.Hc;
- 42.50.Ct;
- 42.70.Qs;
- 71.36.+c;
- Quantum dots;
- Quantum description of interaction of light and matter;
- related experiments;
- Photonic bandgap materials;
- Polaritons;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- Phys. Rev. B 82, 075305 (2010)