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Stability of Biexcitons in Pyramidal InAs/GaAs Quantum Dots
Author(s) -
Stier O.,
Schliwa A.,
Heitz R.,
Grundmann M.,
Bimberg D.
Publication year - 2001
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 - 10.1002/1521-3951(200103)224:1<115::aid-pssb115>3.0.co;2-b
Subject(s) - biexciton , quantum dot , condensed matter physics , binding energy , wave function , exciton , coulomb , physics , quantum mechanics , electron
Biexciton states in realistic quantum dots are investigated theoretically. The few‐particle interactions are shown to depend sensitively on the structural, i.e. geometrical and chemical, properties of quantum dots. To investigate the interplay between the Coulomb and long‐range exchange effects in the presence of correlation, we calculate the biexciton binding energy in pyramidal InAs/GaAs dots by configuration interaction, using realistic single‐particle wavefunctions calculated including inhomogeneous strain, spin–orbit interaction, band mixing, and piezoelectricity. We show that both binding or anti‐binding biexciton ground states can occur in self‐organized InAs/GaAs quantum dots, and that this is a generic property of the low symmetry of these dots.