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Polarization dependence of phonon influences in exciton-biexciton quantum dot systems

Title data

Glässl, Martin ; Axt, Vollrath M.:
Polarization dependence of phonon influences in exciton-biexciton quantum dot systems.
In: Physical Review B. Vol. 86 (2012) Issue 24 . - Art.Nr. 245306, 10 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.86.245306

Project information

Project financing: Studienstiftung des deutschen Volkes

Abstract in another language

We report on a strong dependence of the phonon-induced damping of Rabi dynamics in an optically driven exciton-biexciton quantum dot system on the polarization of the exciting pulse. While for a fixed pulse intensity the damping is maximal for linearly polarized excitation, it decreases with increasing ellipticity of the polarization. This finding is most remarkable considering that the carrier-phonon coupling is spin independent. In addition to simulations based on a numerically exact real-time path-integral approach, we present an analysis within a weak-coupling theory that allows for analytical expressions for the pertinent damping rates. We demonstrate that an efficient coupling to the biexciton state is of central importance for the reported polarization dependencies. Further, we discuss influences of various system parameters and show that, for finite biexciton binding energies, Rabi scenarios differ qualitatively from the widely studied two-level dynamics.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dot; path-integrals; non-linear optics; ultrafast dynamics; pure dephasing; phonons; decoherence; excitons; biexcitons; non-Markovian dynamics; memory effects; phonon-induced memory; multi-phonon processes; polarizition dependence of the damping of Rabi oscillations; numerically complete real-time path integrals; quantum dissipative dynamics; phonon induced relaxation
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: 02 Nov 2017 13:18
Last Modified: 02 Nov 2017 13:18
URI: https://eref.uni-bayreuth.de/id/eprint/40248