Oscillator strength reduction induced by external electric fields in self-assembled quantum dots and rings

Nanophotonic Waveguides by Self-Assembled Quantum Dots

In order to construct ultra-high density photonic integrated circuits, innovative techniques are required to circumvent the fundamental restriction set by Heisenberg’s Uncertainty Principle and the resulting diffraction limit. Traditionally, waveguides adhere to a lower bound in size roughly equal to the propagating wavelength to allow for energy confinement and minimal crosstalk. However, prog...

Large quantum dots with small oscillator strength

S. Stobbe,1,* T. W. Schlereth,2,3 S. Höfling,2,3 A. Forchel,2,3 J. M. Hvam,1 and P. Lodahl1,† 1DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800 Kgs. Lyngby, Denmark 2Technische Physik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany 3Wilhelm Conrad Röntgen-Center for Complex Material Systems (RCCM), Am Hubland, D-97074 Wür...

Light-induced spectral diffusion in single self-assembled quantum dots

Small ensembles of In0.55Al0.45As self-assembled quantum dots have been studied at low temperatures using near-field scanning optical microscopy. We observe spectral diffusion in individual quantum dot luminescence lines. The phenomenon increases in magnitude with optical power density, but is not visible at low powers. We believe the spectral diffusion to be caused by long time-scale trapping ...

Self-assembled Nanorings and Stressor Quantum Dots

Kondo excitons in self-assembled quantum dots

A. O. Govorov, K. Karrai, and R. J. Warburton Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA Institute of Semiconductor Physics, 630090 Novosibirsk, Russia Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany Department of Physics, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom ~R...