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Demonstrating the decoupling regime of the electron-phonon interaction in a quantum dot using chirped optical excitation

Kaldewey, Timo and Lueker, Sebastian and Kuhlmann, Andreas V. and Valentin, Sascha R. and Chauveau, Jean-Michel and Ludwig, Arne and Wieck, Andreas D. and Reiter, Doris E. and Kuhn, Tilmann and Warburton, Richard J.. (2017) Demonstrating the decoupling regime of the electron-phonon interaction in a quantum dot using chirped optical excitation. Physical Review B, 95 (24). p. 241306.

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Abstract

Excitation of a semiconductor quantum dot with a chirped laser pulse allows excitons to be created by rapid adiabatic passage. In quantum dots this process can be greatly hindered by the coupling to phonons. Here we add a high chirp rate to ultrashort laser pulses and use these pulses to excite a single quantum dot. We demonstrate that we enter a regime where the exciton-phonon coupling is effective for small pulse areas, while for higher pulse areas a decoupling of the exciton from the phonons occurs. We thus discover a reappearance of rapid adiabatic passage, in analogy to the predicted reappearance of Rabi rotations at high pulse areas. The measured results are in good agreement with theoretical calculations.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
UniBasel Contributors:Warburton, Richard J and Kaldewey, Timo
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:2469-9950
e-ISSN:2469-9969
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:10 Jan 2018 12:00
Deposited On:10 Jan 2018 12:00

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