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Recombination of Many‐Particle States in InAs Self‐Organized Quantum Dots
Author(s) -
Yuan Z.L.,
Foo E.R.A.D.,
Ryan J.F.,
Mowbray D.J.,
Skolnick M.S.,
Hopkinson M.
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)224:2<409::aid-pssb409>3.0.co;2-n
Subject(s) - photoluminescence , quantum dot , relaxation (psychology) , renormalization , spectroscopy , homogeneous , condensed matter physics , physics , particle (ecology) , molecular physics , quantum mechanics , optoelectronics , statistical physics , oceanography , geology , psychology , social psychology
Strong many‐body effects have been observed in the time‐resolved photoluminescence spectroscopy of self‐organized InAs/GaAs quantum dots. Our results show that the effects generate a considerable bandgap renormalization, being 28 meV at a dot occupancy of 20 electron–hole pairs for the lowest transition. It is also found that many‐particle state scattering gives rise to a large homogeneous broadening of the photoluminescence peak, from which we estimate the intradot relaxation time to be 300 fs. The fast intradot relaxation is supported by time‐resolved measurements with direct excitation.