Brooke, T. and Bootsmann, M.-T. and Wunsch, B. and Tews, M. and Pfannkuche, D. and Heyn, Ch. and Hansen, W. and Heitmann, Detlef and Schüller, Christian (2004) Inelastic light scattering on few-electron quantum-dot atoms. Physica E Low-dimensional Systems and Nanostructures 22 (1-3), pp. 478-481.
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We investigate InAs self-assembled quantum dots (SAQD) by resonant inelastic light scattering. By applying a gate voltage between a metallic front gate and a back electrode, we can charge the quantum dots with single electrons (1–6). With resonant inelastic light scattering, we can directly observe the elementary electronic excitations of the few-electron quantum-dot atoms, which are formed by the SAQD. We observe excitations which we identify as transitions of electrons from the s- to the p-shell (s–p transitions) and from the p- to the d-shell (p–d transitions) of the quasiatoms. We find that the s–p transition energy decreases when the p-shell is filled with 1–4 electrons. This can be explained as an effect of Coulomb interaction, which is confirmed by calculations of the few-electron system, using exact numerical diagonalization.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller|
|Keywords:||Quantum dots; Inelastic light scattering; Electronic excitations|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||02 Oct 2009 08:26|
|Last Modified:||02 Oct 2009 08:26|