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Fine Structure of Exciton Levels in Strained Quantum Dots
Author(s) -
Tsitsishvili E.
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(200112)228:3<671::aid-pssb671>3.0.co;2-c
Subject(s) - quantum dot , condensed matter physics , anisotropy , exciton , ground state , exchange interaction , lattice (music) , polarization (electrochemistry) , electron , physics , materials science , chemistry , quantum mechanics , ferromagnetism , acoustics
The excitonic ground state in single quantum dots with structural anisotropy is studied in dependence on the magnitude of the electron–hole short‐range exchange interaction. Structural anisotropy is described phenomenologically by lattice deformation. The fine structure of the exciton levels is due to an interplay of the deformations and exchange interaction and is the more pronounced the smaller the quantum dots are. The lattice deformations are the reason for optical anisotropy in strained quantum dots. The exchange interaction, however, suppresses the polarization effects which are much more significant in large quantum dots. An additional decrease of the optical anisotropy arises from the coexistence of structural and epitaxial deformations.