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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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1 July 2017

Luminescent nanorods as ultimate probes of fluid flow

A new method, based on the measurement of the polarized luminescence of nanorods, has been developed for the study of the flow in microchannels. This work, carried out in the framework of a (...)

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26 June 2017

Physics renews lung function tests

Physics renews lung function tests
Lung diseases are a major cause of disability and death. Progress in treatment depends critically on how doctors interpret the clinical tests that patients (...)

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17 May 2017

Modeling of grain coarsening in polycristals

Most solids are polycrystalline: they consist of multiple crystalline grains separated by grain boundaries. All the grains are equivalent up to a rotation, and the properties of the grain (...)

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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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