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The electric field-induced modifications of the spatial distribution of photoelectrons, photoholes, and electronic spins in optically pumped p + GaAs are investigated using a polarized luminescence imaging microscopy. At low pump intensity, application of an electric field reveals the tail of charge and spin density of drifting electrons. These tails disappear when the pump intensity is increased since a slight differential drift of photoelectrons and photoholes causes the buildup of a strong internal electric field. Spatial separation of photoholes and photoelectrons is very weak so that photoholes drift in the same direction as photoelectrons, thus exhibiting a negative effective mobility. In contrast, for a zero electric field, no significant ambipolar diffusive effects are found in the same sample.
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23 February 2018

Anderson localization by the alloy disorder in nitride semiconductor devices: the ELENID project funded by the ANR.

Semiconductor devices incorporate alloys that exhibit intrinsic compositional disorder. In nitride-based compounds, because of the large variation of the band gap energy with the composition, the (...)

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9 January 2018

PhD award of University of Paris-Saclay

Marco Piccardo has received the PhD award “Innovative Materials and Applications” for his thesis at Ecole Polytechnique entitled “Spectroscopy of photoelectric processes in III-N structures and (...)

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17 December 2017

single enzyme electrochemistry : SEE project financed by ANR

The development of new biotechnologies is tightly bound to our understanding of biological systems and our capacity to efficiently integrate biomolecules such as redox enzymes in electronic (...)

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11 December 2017

Two projects involving the use of mechanical stress to probe the electronic properties of semiconductors financed by the ANR

Mechanical stress can modify the electronic structure of solids along with the charge carrier dynamics. Although not widely used, externally applied stress can therefore be used to reveal the (...)

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9 November 2017

Des nanobâtonnets comme sondes ultimes de l’écoulement des fluides

Grâce à la synthèse de nanobâtonnets de phosphate de lanthane, des chercheurs sont parvenus à cartographier expérimentalement l’écoulement d’un fluide dans des canaux de très petite taille.
Comment (...)

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