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. © 2003 Elsevier B.V. All rights reserved.
|Number of pages||5|
|Journal||Physica E: Low-Dimensional Systems and Nanostructures|
|Publication status||Published - Mar 2004|
|Event||Proceedings of the Eleventh International Conference on Modulation (MSS11) - Nara, Japan|
Duration: 14 Jul 2003 → 18 Jul 2003
- Magnetic properties
- Quantum dot