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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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17 May 2017

Strained defects in the antipodes

The CNRS has a number of bilateral agreements with foreign universities aimed at promoting new collaborations between CNRS laboratories and these partner institutions. One of these so-called (...)

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17 February 2017

Fausto Sirotti

On January 1st 2017 Fausto Sirotti, Directeur de recherche at CNRS, joined the Group Electrons Photons Surfaces. His scientific interests are directed on photoelectron spectroscopy and his (...)

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16 February 2017

Mechanochromic Luminescence and Liquid Crystallinity of Molecular Copper Clusters

Molecular copper iodide clusters with the [Cu4I4] cubane core have been functionalized by phosphine ligands carrying protomesogenic gallate-based derivatives bearing either long alkyl chains (C8, (...)

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9 June 2016

Thesis prize

Fabian Cadiz has obtained a prize for his thesis of Ecole Polytechnique entitled "Spin dependent transport in semiconductors : a consequence of the Pauli Principle" and supported in July 2015. (...)

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9 May 2016

La thérapie par substitution de surfactant

La thérapie par substitution de surfactant est une technique qui consiste à administrer par voie intra-trachéale le surfactant qui tapisse les zones profondes du poumon et lui permet de se dilater (...)

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