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Transport of a wave packet through nanostructures : Quantum kinetics of carrier capture processes

Title data

Glanemann, Markus ; Axt, Vollrath M. ; Kuhn, Tilmann:
Transport of a wave packet through nanostructures : Quantum kinetics of carrier capture processes.
In: Physical Review B. Vol. 72 (2005) Issue 4 . - No. 045354, 13 Seiten.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.72.045354

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Capture processes of an electronic wave packet traveling in a quantum wire into localized states of an embedded quantum dot by means of phonon emission are studied in a quantum kinetic approach. It turns out that due to the ultrashort length and time scales involved the capture processes exhibit a variety of quantum kinetic features which cannot be described by a simple semiclassical capture rate. We find in general a nonmonotonic rise of the occupation of bound states even at low temperatures where no phonon absorption is possible. This is related to the finite collision duration and the presence of coherent superpositions between initial and final states in the scattering process giving rise to phonon Rabi oscillations between free and trapped states. In the case of more than one bound state in the dot typically a linear combination of these bound states is populated, which leads to a nontrivial dynamics of the trapped carrier density. For potential profiles with large reflection probability it turns out that also the transmission and reflection behavior is modified by the capture process. Finally the theory is applied to a two-band model including optical excitation and excitonic effects. For the scenarios studied in the paper these phenomena lead to some quantitative modifications but they do not change the characteristic quantum features of the capture dynamics.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dot; quantum wire; quantum kinetics; wave packet transport; carrier capture; phonon induced capture; LO phonons; phonon Rabi oscillations
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 11:14
Last Modified: 23 Oct 2017 11:14
URI: https://eref.uni-bayreuth.de/id/eprint/40125