Article abstract
Nature Physics 2, 759 - 764 (2006)
doi:10.1038/nphys433
Subject Categories: Condensed-matter physics | Electronics, photonics and device physics | Optical physics | Nanotechnology | Statistical physics, thermodynamics and nonlinear dynamics
Unconventional motional narrowing in the optical spectrum of a semiconductor quantum dot
A. Berthelot1, I. Favero1, G. Cassabois1, C. Voisin1, C. Delalande1, Ph. Roussignol1, R. Ferreira1 and J. M. Gérard2
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.
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure, 24 rue Lhomond 75231 Paris Cedex 5, France
- CEA-CNRS-UJF "Nanophysics and Semiconductors" Laboratory, CEA/DRFMC/SP2M, 17 rue des Martyrs 38054 Grenoble Cedex 9, France
Correspondence to: G. Cassabois1 e-mail: Guillaume.Cassabois@lpa.ens.fr
MORE ARTICLES LIKE THIS
These links to content published by NPG are automatically generated.
RESEARCH
Electrically driven thermal light emission from individual single-walled carbon nanotubesNature Nanotechnology Letter (01 Jan 2007)
Coherent properties of a two-level system based on a quantum-dot photodiodeNature Letters to Editor (08 Aug 2002)
Supplementary InformationNature Physics Article (01 Oct 2009)
Gain without inversion in semiconductor nanostructuresNature Materials Letter (01 Mar 2006)
See all 36 matches for Research
