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Analytical results for nonlinear optical signals from quantum dots coupled to phonons

Title data

Axt, Vollrath M. ; Krummheuer, B. ; Vagov, Alexei ; Kuhn, Tilmann:
Analytical results for nonlinear optical signals from quantum dots coupled to phonons.
In: Physica Status Solidi B. Vol. 238 (2003) Issue 3 . - pp. 581-588.
ISSN 0370-1972
DOI: https://doi.org/10.1002/pssb.200303175

Project information

Project financing: European Commission within the Future and Emerging Technologies (FET) project IST-1999-11311 (Semiconductor-based Implementation of Quantum Information Devices)

Abstract in another language

The impact of pure dephasing processes on the optically induced nonlinear dynamics of quantum dots is analyzed. Concentrating on small dots pure dephasing can be studied analytically in the limit of ultrafast excitation. General conclusions from the analysis of the closed form formulas include the prediction that four-wave-mixing (FWM) spectra of single dots change from asymmetric to symmetric lineshapes with increasing pulse delay. Furthermore, in contrast to phenomenological dephasing models the delay dependence of the time integrated FWM amplitude |PFWM| generated by a strongly inhomogeneously broadened ensemble deviates from the real time dependence of |Plin|2, where Plin is the linear polarization emitted by a single dot. Numerical results are presented for FWM signals from dots coupled to bulk acoustic phonons. Surprisingly, the initial decay time of the signal depends non-monotonously on the temperature. In addition, it is shown that for certain material parameters the coupling to the smooth continuum of acoustic phonons may result in pronounced oscillations.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dot; generating functions; non-linear optics; ultrafast dynamics; pure dephasing; phonons; analytical solutions; phonon sidebands; excitons; four-wave mixing; polaron formation; Non-perturbative solution
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: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 23 Oct 2017 08:18
Last Modified: 23 Oct 2017 08:18
URI: https://eref.uni-bayreuth.de/id/eprint/40101