Optical susceptibility of metal nanoparticle-double quantum dot hybrid system

This work is modeling the linear optical susceptibility of a double quantum dot (DQD)-metal nanoparticle (MNP) hybrid system using density matrix equations that consider the interaction between excitons and surface plasmons. The wetting layer (WL)-QD interaction is considered. The absorption of the hybrid DQD-MNP system increases by five times compared to the bare DQD system. The absorption peak is reducing in a similar ratio of increasing MNP radius. A Mollow triplet with asymmetric sidebands appears and decreases with increasing MNP radius, which is compatible with recent experi-mental evidence. The susceptibility peaks at resonance for a small distance between the hybrid MNP-DQD. The susceptibility is increased by one order for the DQD system compared to a single QD. A similar result is obtained under WL-QD detuning compared to the case of the probe between DQD states. Small DQDs give high absorption and dispersion, offering more shifts from resonance.

Automated summary

This study models the linear optical susceptibility of a double quantum dot-metal nanoparticle hybrid system using density matrix equations. The interaction between excitons and surface plasmons is considered. The results show that the absorption of the hybrid system increases by five times compared to the bare double quantum dot system. The absorption peak decreases with increasing nanoparticle radius. A Mollow triplet with asymmetric sidebands is observed and decreases with increasing nanoparticle radius.