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Direct and exchange Coulomb energies in CdSe/ZnSe quantum dots
Author(s) -
Graham T. C. M.,
Curran A.,
Tang X.,
Morrod J. K.,
Prior K. A.,
Warburton R. J.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200564654
Subject(s) - quantum dot , coulomb , exciton , electron , photoluminescence , condensed matter physics , atomic physics , coulomb blockade , physics , coulomb barrier , electric field , symmetry (geometry) , transistor , nuclear physics , quantum mechanics , optoelectronics , voltage , geometry , mathematics
We have determined the direct and exchange electron–electron and electron–hole Coulomb energies in CdSe/ZnSe quantum dots. The experiments are based on single dot photoluminescence at low temperature. By controlling the charging with a vertical transistor structure and by applying a symmetry‐breaking magnetic field, we show how we can determine all the Coulomb energies. The direct Coulomb energies are responsible for large, ∼20 meV, red‐shifts of the emission on charging. The exchange Coulomb energies lead to a very pronounced fine structure splitting, up to 2.6 meV, for the neutral exciton. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)