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Excitation Spectrum, Relaxation and Coherence of Single Self‐Assembled CdSe Quantum Dots
Author(s) -
Hundt A.,
Flissikowski T.,
Lowisch M.,
Rabe M.,
Henneberger F.
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<159::aid-pssb159>3.0.co;2-g
Subject(s) - exciton , excitation , quantum dot , excited state , phonon , relaxation (psychology) , coherence (philosophical gambling strategy) , biexciton , atomic physics , photon , coupling (piping) , quantum beats , condensed matter physics , physics , materials science , molecular physics , optoelectronics , optics , quantum mechanics , psychology , social psychology , metallurgy
We report on ultra‐narrow, long‐term stable emission of single, self‐assembled CdSe/ZnSe QDs. The excitation spectrum reveals a spectrally sharp excited state with a lifetime of 1.5 ps, related to the LO‐phonon decay. In addition, excitation features due to optical and acoustic phonons are present. A strong increase of the exciton–acoustic‐phonon coupling is found. The spin relaxation time is much longer than the exciton lifetime of 250 ps. Under resonant excitation, photon beats from a single QD are seen. Coherence of the purely radiatively damped QD exciton is maintained until it recombines.