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Emission from neutral and charged excitons in a single quantum dot in a magnetic field |
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| Authors: | C Schulhauser R J Warburton A Hgele A O Govorov K Karrai J M Garcia B D Gerardot P M Petroff |
| Institution: | a Sektion Physik und CeNS, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, D-80539, München, Germany;b Department of Physics, Heriot-Watt University, Edinburgh EH14 4AS, UK;c Department of Physics and Astronomy, Ohio University, Athens, OH, USA;d Instituto de Microelectronica de Madrid, CNM-CSIC Isaac Newton, 8 (PTM), 28760, Madrid, Spain;e Materials Department, University of California, Santa Barbara, CA 93106, USA |
| Abstract: | We report on optical spectroscopy of self-assembled InAs quantum dots in a magnetic field. We describe how we measure the emission characteristics of a single quantum dot (QD) in high magnetic fields at low temperature using a miniature, fiber-based confocal microscope. Example results are presented on a QD whose charge can be controlled using a field-effect device. For the uncharged, singly and doubly charged excitons we find a diamagnetism and the spin Zeeman effect. In contrast, for the triply-charged exciton we find a fundamentally different behavior. Anti-crossings in magnetic field imply that confined states of the QD are hybridized with Landau-like levels associated with the two-dimensional continuum. |
| Keywords: | Author Keywords: Spectroscopy Quantum dot Photoluminescence Magnetic properties |
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