%0 Journal Article
%T Dephasing processes in a single semiconductor quantum dot
%+ Laboratoire Pierre Aigrain (LPA)
%A Cassabois, Guillaume
%A Ferreira, Robson
%< avec comité de lecture
%Z Optique cohérente et non linéaire
%@ 1631-0705
%J Comptes Rendus. Physique
%I Académie des sciences (Paris)
%V 9
%N 8
%P 830
%8 2008
%D 2008
%Z Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]Journal articles
%X We discuss the decoherence dynamics in a single semiconductor quantum dot and analyze two dephasing mech- anisms. In the ¯rst part of the review, we examine the intrinsic source of dephasing provided by the coupling to acoustic phonons. We show that the non-perturbative reaction of the lattice to the interband optical transition results in a composite optical spectrum with a central zero-phonon line and lateral side-bands. In fact, these acoustic phonon side-bands completely dominate the quantum dot optical response at room temperature. In the second part of the paper, we focus on the extrinsic dephasing mechanism of spectral di®usion that determines the quantum dot decoherence at low temperatures. We interpret the variations of both width and shape of the zero- phonon line as due to the °uctuating electrostatic environment. In particular, we demonstrate the existence of a motional narrowing regime in the limit of low incident power or low temperature, thus revealing an unconventional phenomenology compared to nuclear magnetic resonance.
%G English
%2 https://hal.science/hal-00465011/document
%2 https://hal.science/hal-00465011/file/Cassabois_Ferreira.pdf
%L hal-00465011
%U https://hal.science/hal-00465011
%~ UNIV-PARIS7
%~ ENS-PARIS
%~ UPMC
%~ LPA
%~ CNRS
%~ LPA-OPT
%~ PSL
%~ UPMC_POLE_2
%~ SORBONNE-UNIVERSITE
%~ SU-SCIENCES
%~ UNIV-PARIS
%~ ENS-PSL
%~ SU-TI
%~ ALLIANCE-SU