Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 48: Poster 2
HL 48.49: Poster
Donnerstag, 26. März 2009, 15:00–17:30, P2
Spectroscopy on charge-tunable InGaAs quantum dots — •Dennis Franz1, Tim Köppen1, Andreas Schramm2, Christian Heyn1, Detlef Heitmann1, and Tobias Kipp1 — 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Germany — 2Optoelectronics Research Center, Tampere University of Technology, Finland
We investigate electronic excitations in charge-tunable InGaAs quantum dots by resonant Raman and resonant photoluminescence spectroscopy in magnetic fields. In contrast to earlier measurements at the E0 + Δ gap [1,2], we excite resonantly at the fundamental E0 gap. Exploiting capacitance-voltage measurements one can control the electron number in the quantum dots. We study the zero, one, and two electron case and observe strongly resonant emission signals. For the one and two electron case, besides photoluminescence resonant electronic Raman transitions are identified.
This project is supported by the Deutsche Forschungsgemeinschaft via SFB 508 “Quantenmaterialien".
[1] L. Chu et al., Appl. Phys. Lett. 77, 3944 (2000)
[2] T. Brocke et al., Phys. Rev. Lett. 91, 257401 (2003)