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Dynamics of quantum dots with strong electron phonon coupling: Correlation expansion vs. path integrals
Author(s) -
Vagov A.,
Croitoru M. D.,
Axt V. M.,
Machnikowski P.,
Kuhn T.
Publication year - 2011
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.201000842
Subject(s) - phonon , decoupling (probability) , coupling (piping) , physics , condensed matter physics , electron , quantum dot , correlation , path integral formulation , electronic correlation , pulse (music) , quantum , quantum mechanics , materials science , mathematics , geometry , control engineering , voltage , engineering , metallurgy
Abstract We have simulated coherent control signals from quantum dots for carrier phonon interactions covering the low as well as the strong coupling limit. Calculations using the correlation expansion for phonon assisted density matrices are compared with numerically exact results obtained from a time dependent path‐integral approach. Even at elevated coupling strengths both calculations agree well for not too high temperatures. For pulse lengths and delay times shorter than the phonon induced memory time the correlation expansion gives good results in almost all cases. For strong coupling and/or high temperatures drastic discrepancies emerge. Interestingly, the correlation expansion works better at high pulse areas, which is related to a dynamic decoupling of electron and phonon dynamics in strongly confined systems.