Excitons and photons in cavity-embedded quantum dot lattices

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• Dr Michal Grochol (Instut Fur Theoretische Physik, Germany)
• Tuesday 15 December 2009, 11:30-13:00
• TCM Seminar Room, Cavendish Lab., JJ Thomson Ave.,Cambridge CB3 OHE.

If you have a question about this talk, please contact pjh65.

We investigate excitons and trions in a two-dimensional quantum dot lattice embedded in a planar optical cavity. The strong exciton (trion)-photon coupling is described in terms of polariton quasiparticles with extremely small mass, which makes them the lightest exciton-like quasiparticles in solids. The effect of disorder is also discussed. Furthermore, one electron is added into each dot. Such a “spin lattice” can be used for quantum information processing and we show that by using exciton detuning a conditional phase shift gate with a high fidelity can be obtained. Finally, we investigate exciton-photon quantum phase transitions in a planar lattice of one-mode cavities containing one quantum dot. We demonstrate that by controlling exciton- and photon-hopping energies a very rich scenario of coupled fermionic-bosonic quantum phase transitions appears.

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