Direct and exchange Coulomb energies in CdSe/ZnSe quantum dots | Zendy

Graham T. C. M. | Zendy; Curran A. | Zendy; Tang X. | Zendy; Morrod J. K. | Zendy; Prior K. A. | Zendy; Warburton R. J. | Zendy

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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)

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