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 ultra-short 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.
@article{arxiv.1701.01304,
title = {Demonstrating the decoupling regime of the electron-phonon interaction in a quantum dot using chirped optical excitation},
author = {Timo Kaldewey and Sebastian Lüker and Andreas V. Kuhlmann and Sascha R. Valentin and Jean-Michel Chauveau and Arne Ludwig and Andreas D. Wieck and Doris E. Reiter and Tilmann Kuhn and Richard J. Warburton},
journal= {arXiv preprint arXiv:1701.01304},
year = {2017}
}
Comments
Main manuscript 5 pages and 4 figures, Supplementary Information 5 pages and 3 figures, submitted to PRL