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Dynamics of quantum dots with strong electron phonon coupling : Correlation expansion vs. path integrals

Title data

Vagov, Alexei ; Croitoru, Mikhail D. ; Axt, Vollrath M. ; Machnikowski, Paweł ; Kuhn, Tilmann:
Dynamics of quantum dots with strong electron phonon coupling : Correlation expansion vs. path integrals.
In: Physica Status Solidi B. Vol. 248 (2011) Issue 4 . - pp. 839-842.
ISSN 0370-1972
DOI: https://doi.org/10.1002/pssb.201000842

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: correlation expansion; numerical real-time path integrals; strong carrier phonon coupling; coherent control; phonons; quantum dots
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 30 Oct 2017 13:49
Last Modified: 30 Oct 2017 13:49
URI: https://eref.uni-bayreuth.de/id/eprint/40224