Brocke, T. and Bootsmann, M.-T. and Tews, M. and Wunsch, B. and Pfannkuche, D. and Heyn, Ch. and Hansen, W. and Heitmann, Detlef and Schüller, Christian (2003) Spectroscopy of Few-Electron Collective Excitations in Charge-Tunable Artificial Atoms. Applied Physics Letters 91 (25; 4 ), p. 257401.
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We report the investigation of electronic excitations in InGaAs self-assembled quantum dots using resonant inelastic light scattering. The dots can be charged via a gate by N = 1,[ellipsis (horizontal)],6 electrons. We observe excitations, which are identified as transitions of electrons, predominantly from the s to the p shell (s–p transitions) of the quasiatoms. We find that the s–p transition energy decreases and the observed band broadens, when the p shell is filled with 1 to 4 electrons. By a theoretical model, which takes into account the full Coulomb interaction in the few-electron artificial atom, we can confirm the experimental results to be an effect of the Coulomb interaction in the quantum dot.
|Date:||15 December 2003|
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller|
|Keywords:||indium compounds, gallium arsenide, semiconductor quantum dots, light scattering, III-V semiconductors, spectral line broadening, red shift|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||21 Sep 2009 07:12|
|Last Modified:||20 Jul 2011 21:44|