Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 95: Poster IV B (Quantum dots and wires: Prepration, characterization, optical properties, and transport)

HL 95.8: Poster

Donnerstag, 19. März 2015, 14:00–20:00, Poster B

Efficient calculaltion of the Coulomb coupling elements including monopole-monopole interaction and Förster transfer between quantum dots — •Anke Zimmermann and Marten Richter — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, EW 7-1, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany

Coulomb coupled semiconductor quantum dots provide a great flexibility for controlling their optical properties. Due to the couplings between the quantum dots the individual characteristics of separated quantum dots are modified and new collective states are formed. Examples include dipole induced Förster coupling transfer and the monopole-monopole interaction.

The calculation of the Coulomb coupling involves the evaluation of a six dimensional integral of the diverging Coulomb potential. For applications in materials with different permittivity (e.g. quantum dots in a solvent) the numerical complexity can be greatly reduced by using solutions of the modified Poisson equation.

To see the effects of Coulomb coupling on single excitons and biexcitons the double quantum coherence spectroscopy is used. It allows an investigation of the coupling mechanisms and a deeper insight into the involved processes. The characteristic optical signatures of quantum dots at different position with varying orientations can be calculated, for seeing more information about the spatial arrangement.