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HL: Halbleiterphysik
HL 26: Symposium: Spectroscopy of Single Quantum Dots
HL 26.2: Fachvortrag
Donnerstag, 29. März 2001, 11:00–11:30, S2
Interband emission from charge tuneable ring-shaped quantum dots — •Khaled Karrai1, Dirk Haft1, C. Schulhauser1, R.J. Warburton1, A. Govorov2, J.M. Garcia3, W. Schoenfeld3, and Pierre M. Petroff3 — 1Center for NanoScience (CeNS) and Sektion Physik der Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany — 2Institute of Semiconductor Physics, Russian Academy of Sciences, Siberian Branch, 630090 Novosibirsk, Russia — 3Center for Quantized Electronic Structures (QUEST) and Materials Department, University of California, Santa Barbara, California 93106
The photoluminescence of self assembled GaInAs Ring shaped quantum dots is investigated at 4.2 K under high magnetic fields. The investigated quantum dots are imbededded in a field effect structure. The number of electrons present in such dots can be tuned from N=0 to about 6 by applying a gate voltage ranging from -1 to +0.5 V.
The excitonic emission is measured on a single quantum dot as a function of N. Like in atoms, electron-electron interactions are found to affect drastically the measured optical spectra [1]. The magneto-optical properties of single quantum dots are also measured for different charge states of the dot. The excitonic energy dependence in magnetic field (0 to 9T) is found to be a function of N as well as of the topology of the confining potential.
[1] R.J. Warburton et al., Nature 405, 926-929 (2000)