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.

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

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