Unconventional motional narrowing in the optical spectrum of a semiconductor quantum dot

ABSTRACT ‘Motional narrowing’ refers to the striking phenomenon where the resonance line of a system coupled to a reservoir becomes narrower on increasing the reservoir fluctuation. A

textbook example is found in nuclear magnetic resonance, where the fluctuating local magnetic fields created by randomly oriented nuclear spins are averaged when the motion of the nuclei is

thermally activated. The existence of a motional-narrowing effect in the optical response of semiconductor quantum dots remains so far unexplored. This effect may be important in this

instance because the decoherence dynamics is a central issue for the implementation of quantum information processing based on quantum dots. Here we report on the experimental evidence of

motional narrowing in the optical spectrum of a semiconductor quantum dot broadened by the spectral-diffusion phenomenon. Surprisingly, motional narrowing is achieved when decreasing

incident power or temperature, in contrast with the standard phenomenology observed for nuclear magnetic resonance. Access through your institution Buy or subscribe This is a preview of

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SUPPRESSION OF NUCLEAR SPIN FLUCTUATIONS IN AN INGAAS QUANTUM DOT ENSEMBLE BY GHZ-PULSED OPTICAL EXCITATION Article Open access 16 April 2021 REFERENCES * Bloembergen, N., Purcell, E. M.

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Jankovic, C. Ciuti and B. Gayral for discussions. LPA-ENS is ‘unité mixte (UMR 8551) de l’ENS, du CNRS, des Universités Paris 6 et 7’. This work is financially supported by the region Ile de

 France. AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Laboratoire Pierre Aigrain, Ecole Normale Supérieure, 24 rue Lhomond 75231 Paris Cedex 5, France A. Berthelot, I. Favero, G. Cassabois,

 C. Voisin, C. Delalande, Ph. Roussignol & R. Ferreira * CEA-CNRS-UJF “Nanophysics and Semiconductors” Laboratory, CEA/DRFMC/SP2M, 17 rue des Martyrs 38054 Grenoble Cedex 9, France J. M.

Gérard Authors * A. Berthelot View author publications You can also search for this author inPubMed Google Scholar * I. Favero View author publications You can also search for this author

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can also search for this author inPubMed Google Scholar CORRESPONDING AUTHOR Correspondence to G. Cassabois. ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing

financial interests. RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Berthelot, A., Favero, I., Cassabois, G. _et al._ Unconventional motional narrowing

in the optical spectrum of a semiconductor quantum dot. _Nature Phys_ 2, 759–764 (2006). https://doi.org/10.1038/nphys433 Download citation * Received: 30 May 2006 * Accepted: 13 September

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