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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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11 December 2017
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 (...)
9 November 2017
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. (...)
9 August 2017
Light-emitting diodes are nowadays increasingly used, and, if widely implemented in general lighting with an energy conversion efficiency of 80%, would save 10% of the electricity consumed (...)
12 July 2017
A Korean student, Jeongmo KIM, undertook his Master2 internship in the Solid Chemicals group of PMC, on the theme of nanorods (from the nano object to the device). He was awarded a prestigious (...)
1 July 2017
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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