W. V. Schoenfeld

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Quantum communication relies on the availability of light pulses with strong quantum correlations among photons. An example of such an optical source is a single-photon pulse with a vanishing probability for detecting two or more photons. Using pulsed laser excitation of a single quantum dot, a single-photon turnstile device that generates a train of(More)
Individual quantum dots have been studied by means of microphotoluminescence with dual-laser excitation. The additional infrared laser influences the dot charge configuration and increases the dot luminescence intensity. This is explained in terms of separate generation of excess electrons and holes into the dot from the two lasers. With increasing dot(More)
We investigate the intensity correlation properties of single photons emitted from an optically excited single semiconductor quantum dot. The second order temporal coherence function of the photons emitted at various wavelengths is measured as a function of the excitation power. We show experimentally and theoretically that a quantum dot is not only a(More)
An experimental evidence of Auger-like excitation processes in InAs/GaAs quantum dots is demonstrated. Photoluminescence spectra of resonantly excited dots exhibit a rich satellite structure below the ground-state emission band. The energy position and the intensity distribution of the satellites are analyzed and an interpretation of the satellites as due(More)
E. S. Moskalenko, V. Donchev, K. F. Karlsson, P. O. Holtz, B. Monemar, W. V. Schoenfeld, J. M. Garcia, and P. M. Petroff Department of Physics and Measurement Technology, Linköping University, S-581 83 Linköping, Sweden A.F. Ioffe Physical-Technical Institute, RAS, 194021, Polytechnicheskaya 26, St. Petersburg, Russia Faculty of Physics, Sofia University,(More)
E. S. Moskalenko, K. F. Karlsson, P. O. Holtz, B. Monemar, W. V. Schoenfeld, J. M. Garcia, and P. M. Petroff Department of Physics and Measurement Technology, Linköping University, S-581 83 Linköping, Sweden A. F. Ioffe Physical-Technical Institute, RAS, 194021, Polytechnicheskaya 26, St. Petersburg, Russia Materials Department, University of California,(More)
Arsenic trisulfide (As2S3) is a chalcogenide (ChG) material with excellent infrared (IR) transparency (620 nm to 11 μm), low phonon energies, and large nonlinear refractive indices. These properties directly relate to commercial and industrial applications including sensors, photonic waveguides, and acousto-optics. Multi-photon exposure can be used to(More)
C. Schulhauser, D. Haft, R. J. Warburton, K. Karrai, A. O. Govorov, 1,3,4 A. V. Kalameitsev, A. Chaplik, W. Schoenfeld, J. M. Garcia, and P. M. Petroff Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, D-80539 München, Germany Department of Physics, Heriot-Watt University, Edinburgh EH14 4AS, United(More)
We study optically single self-assembled quantum dots embedded within the wide quantum well of a mixed type quantum structure. We compare the steady state and pulsed photoluminescence spectra of these dots to those of previously studied ”regular” dots. We unambiguously identify experimentally emission from various discrete charge state of the dots. We(More)