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Optica Publishing Group
  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper CB_14

Quantum theory of the optical excitation of a semiconductor quantum dot

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Abstract

Present-day quantum-dot experiments are already in the regime where a fully quantum-mechanical description is needed to explain and predict the system properties. As a starting point, one can e. g. solve the true many-body states within the dot by means of diagonalization techniques and configuration-interaction calculations. However, these methods become very intricate when the coupling of the dot-carrier system to the environment cannot be neglected anymore. In many experimentally relevant situations, the coupling of the quantum dot to phonons, wetting-layer states or quantized light modes plays a crucial role. The resulting many-body quantum dynamics has successfully been modeled in quantum-well systems using the so-called cluster-expansion approach [1]. In the present work, we apply this technique to the theory of quantum dots to include all single- and two-particle contributions into the analysis. Especially, this enables us to distinguish uncorrelated plasma from bound electron-hole pairs, i. e. excitons.

© 2007 IEEE

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