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

Kaldewey T., Lüker S., Kuhlmann A., Valentin S., Chauveau J., Ludwig A., Wieck A., Reiter D., Kuhn T., Warburton R.

Research article (journal)

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.

Details zur Publikation

Publisher:
Release year: 2017
Publishing company: American Physical Society
Language in which the publication is written: English
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