Optical studies of individual InAs quantum dots in GaAs: few-particle effects |
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| Authors: | L Landin MS Miller M Pistol CE Pryor L Samuelson |
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| Institution: | Department of Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden. |
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| Abstract: | Optical emission from individual strained indium arsenide (InAs) islands buried in gallium arsenide (GaAs) was studied. At low excitation power density, the spectra from these quantum dots consist of a single line. At higher excitation power density, additional emission lines appeared at both higher and lower energies, separated from the main line by about 1 millielectron volt. At even higher excitation power density, this set of lines was replaced by a broad emission peaking below the original line. The splittings were an order of magnitude smaller than the lowest single-electron or single-hole excited state energies, indicating that the fine structure results from few-particle interactions in the dot. Calculations of few-particle effects give splittings of the observed magnitude. |
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