Abstract
The study of quantum mechanical interactions between excited carriers in the semiconductor quantum dots (QDs) provides better understanding of zero-dimensional (0D) systems. One of the remarkable features of QDs is their atomic like density of states (DOS). Recently, we performed single dot spectroscopy on InGaAs seif-assembled quantum dots (SAQDs) grown by Stranski-Krastnow mode, and found that their photoluminescencc excitation (PLE) spectra exhibit 2D-like continuum states as well as discrete DOS structures.1 Because SAQDs are connected with 2D wetting layer (WL), it is supposed that the observed continuum originate from a crossover from OD to 2D nature in their DOS. On the other hand, excited carriers in a single discrete state within a continuum show asymmetric resonance in their optical spectrum. This asymmetry is produced by interference between the optical transitions of a discrete energy state with continuum, the so-called Fano interference. In this paper, we carried out PLE spectroscopy with high excitation power and observed asymmetric resonances due to the existence of continuum states.
© 2001 Optical Society of America
PDF ArticleMore Like This
Y. Toda, S. Shinomori, O. Moriwaki, and Y. Arakawa
QTuC1 Quantum Electronics and Laser Science Conference (CLEO:FS) 1999
H. Htoon, D. Kulik, C. K. Shih, O. Baktenov, A. L. Holmes, and T. Takagahara
QMF3 Quantum Electronics and Laser Science Conference (CLEO:FS) 2001
T. Sugimoto, Y. Toda, S. Ishida, M. Nishioka, T. Someya, and Y. Arakawa
QTuD3 Quantum Electronics and Laser Science Conference (CLEO:FS) 2000