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Proceedings Paper

Theory of phonon-assisted intraband transitions in semiconductor quantum dots
Author(s): Sandra Kuhn; Franz Schulze; Marten Richter; Andreas Knorr; Alexander Carmele
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Paper Abstract

The investigation of the intersubband dynamics occurring in the conduction band of doped semiconductor quantum dots (QD's) has emerged as a powerful tool to probe their electronic structure and properties. Here, the temperature, the dephasing and the relaxation dynamics are of interest, both from a fundamental point of view but also regarding the performance of QD-based optoelectronic devices. Whereas the lineshape of QD interband transitions is well described by the independent boson model treating a diagonal electron-phonon coupling. For intraband transitions both diagonal and non-diagonal electron-phonon coupling are relevant. Typically, such problems involving diagonal and non-diagonal coupling are treated within approximate or perturbative approaches. Here, we present a fully quantized theory to calculate the coupled electron-phonon dynamics based on a non-perturbative equation of motion approach reproducing also correct results for limits of known exactly solvable models.

Paper Details

Date Published: 20 February 2012
PDF: 8 pages
Proc. SPIE 8260, Ultrafast Phenomena and Nanophotonics XVI, 826004 (20 February 2012); doi: 10.1117/12.906611
Show Author Affiliations
Sandra Kuhn, Technische Univ. Berlin (Germany)
Franz Schulze, Technische Univ. Berlin (Germany)
Marten Richter, Technische Univ. Berlin (Germany)
Andreas Knorr, Technische Univ. Berlin (Germany)
Alexander Carmele, Technische Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 8260:
Ultrafast Phenomena and Nanophotonics XVI
Markus Betz; Abdulhakem Y. Elezzabi; Jin-Joo Song; Kong-Thon Tsen, Editor(s)

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