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Spatiotemporal dynamics in optically excited quantum wire-dot systems : Capture, escape, and wave-front dynamics

Title data

Reiter, Doris ; Glanemann, Markus ; Axt, Vollrath M. ; Kuhn, Tilmann:
Spatiotemporal dynamics in optically excited quantum wire-dot systems : Capture, escape, and wave-front dynamics.
In: Physical Review B. Vol. 75 (2007) Issue 20 . - No. 205327, 9 Seiten.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.75.205327

Abstract in another language

Transitions of optically excited carriers between delocalized states in a quantum wire and localized states in a quantum dot are studied on a quantum kinetic level. These transitions are mediated by the emission or absorption of longitudinal optical phonons. Three different excitation scenarios are considered: The capture of a traveling wave packet results in occupations of the bound states and, under suitable conditions, in coherent superpositions. Both occupations and coherences decay due to thermal escape processes resulting from the absorption of phonons. A spatially homogeneous excitation in the quantum wire below the threshold for optical phonon emission leads to capture processes associated with the buildup of a wave front in the carrier density between regions which are already influenced by the capture and regions where this influence is not yet present. A selective excitation of the quantum dot exciton is at elevated temperatures followed by thermal escape processes with a subsequent spreading of the carriers in the quantum wire. We find that for a physically meaningful description of the spatiotemporal dynamics a consistent treatment of both diagonal and off-diagonal density matrix elements is essential in all three scenarios.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dot; quantum wire; quantum kinetics; wave packet transport; carrier capture; carrier escape; phonon induced capture; LO phonons; wave front dynamics
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: 25 Oct 2017 08:23
Last Modified: 25 Oct 2017 08:23
URI: https://eref.uni-bayreuth.de/id/eprint/40165