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Electron-phonon dynamics in optically excited quantum dots : Exact solution for multiple ultrashort laser pulses

Title data

Vagov, Alexei ; Axt, Vollrath M. ; Kuhn, Tilmann:
Electron-phonon dynamics in optically excited quantum dots : Exact solution for multiple ultrashort laser pulses.
In: Physical Review B. Vol. 66 (2002) Issue 16 . - No. 165312.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.66.165312

Project information

Project financing: Supported by the European Commission within the Future and Emerging Technologies (FET) Project No. IST-1999-11311 (Semiconductor-based Implementation of Quantum Information Devices)

Abstract in another language

A model of semiconductor quantum dots coupled to phonons and laser light, which is relevant in the limit of strong electronic confinement, is investigated. For an arbitrary sequence of excitations by ultrafast pulses, analytical solutions are obtained for all pertinent density-matrix elements. The results are nonperturbative with respect to the coupling to both phonons and laser light. The derivation depends neither on a particular choice of electronic wave functions nor on a particular wave-vector dependence of the phonon interaction or phonon dispersion. All components of the density matrix exhibit oscillatory dependences on the pulse areas of the exciting pulses analogously to the Rabi oscillations known from simple two-level systems. Three typical applications of the general results are worked out: (a) the influence of phonons on four-wave-mixing spectra, (b) the coherent control of electronic dot occupations in the presence of phonons, and (c) the dynamics of phonon correlations including the formation of a stable polaron spatially localized in the dot and the emission of a pulsed phonon wave packet that leaves the dot.

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; four-wave mixing; polaron formation; coherent control; phonon wave pakets
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: 18 Oct 2017 09:13
Last Modified: 18 Oct 2017 09:13
URI: https://eref.uni-bayreuth.de/id/eprint/40077