Theory of phonon-assisted intraband transitions in semiconductor quantum dots

Sandra Kuhn; Franz Schulze; Marten Richter; Andreas Knorr; Alexander Carmele

doi:10.1117/12.906611

20 February 2012 Theory of phonon-assisted intraband transitions in semiconductor quantum dots

Sandra Kuhn, Franz Schulze, Marten Richter, Andreas Knorr, Alexander Carmele

Proceedings Volume 8260, Ultrafast Phenomena and Nanophotonics XVI; 826004 (2012) https://doi.org/10.1117/12.906611
Event: SPIE OPTO, 2012, San Francisco, California, United States

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.

Citation Download Citation

Sandra Kuhn, Franz Schulze, Marten Richter, Andreas Knorr, and Alexander Carmele "Theory of phonon-assisted intraband transitions in semiconductor quantum dots", Proc. SPIE 8260, Ultrafast Phenomena and Nanophotonics XVI, 826004 (20 February 2012); https://doi.org/10.1117/12.906611

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