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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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3 April 2020

Influence of the carbon interface on the mechanical behavior of SiC/SiC composites

SiC/SiC composites reinforced with 3rd generation SiC fibers are promising candidates for thermomechanical applications in high technology industries. Not all composites exhibit the same (...)

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2 March 2020

ISAB’s visit at PMC

Ecole polytechnique choose the PMC to show two ISAB (International Scientific Advisory Board) members a flagship experiment currently underway. Wiebke Hahn, doctoral student at PMC, explained (...)

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6 January 2020

Collaboration in Budapest on phase field modeling of solidification

In the framework of a CNRS International Emerging Action (IEA) a group of PMC researchers has visited their colleagues of the Wigner Research center in Budapest. The ongoing collaboration is (...)

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4 September 2019

Work on localization commented in the Journal Club for Condensed Matter Physics

In a three-page article published online in the Journal Club for Condensed Matter Physics, a site where recognized researchers comment once a month on some notable scientific articles), Carlo (...)

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29 August 2019

Electronic coupling in the F4-TCNQ/single layer GaSe heterostructure

Interfacial effects in hybrid heterostructures made of organic molecules adsorbed on two-dimensional metal monochalcogenide can improve the electronic properties of the single constitutive (...)

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