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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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22 July 2019
A collaboration between research groups at C2N, Synchrotron SOLEIL, LSI and PMC on the “plateau de Saclay” and of the UPMC in Paris obtained a precise determination of the electronic structure (...)
22 July 2019
In an international collaboration between groups from Italy, Germany, Japan, France and Great Britain, we combine time resolved pump-probe Magneto-Optical Kerr Effect and Photoelectron (...)
16 July 2019
La diffusion est un phénomène très général qui tend à rendre uniforme la composition d’un milieu dès que celui-ci est spatialement inhomogène. Il a été décrit dès le 19e siècle par des lois (...)
25 June 2019
La conférence internationale BIO-SENSING TECHNOLOGY (BITE2019) s’est tenue à Kuala Lumpur en Malaisie. C’était l’opportunité de découvrir de nouvelles méthodes de détection de biomolécules et (...)
4 June 2019
Le groupe ECM vient de publier dans J. Phys. Chem. C (ACS) un article intitulé « Influence of Light Polarization on Photoswitching of Fulgimide Monolayers on surfaces». Une manière de modifier (...)
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