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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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19 January 2026
When vapor nucleates into liquid, the critical droplets break a key assumption of classical nucleation theory (CNT). CNT assumes that critical droplets have the same density as the final liquid—an (…)
15 January 2026
We are pleased to announce the publication of the new book Classical Electrodynamics: Fundamentals and Applications, co-authored by Fabian Cadiz (PMC Laboratory, École polytechnique – CNRS) and (…)
23 October 2024
Two members of our laboratory have been invited to present their activity to the next french meeting on surfaces and interfaces (Journées Surfaces et Interfaces, JSI 2025) to be held in Orsay from (…)
10 January 2023
DEEP2D both targets new basic knowledge on nanomaterials and its envisioned breakthrough for nanoelectronics and optoelectronics. It belongs to worldwide efforts devoted to basic understanding of (…)
27 October 2022
Cette exposition, portée par le PMC, est accessible au musée de l’Ecole polytechnique (MusX) et présente les différents moyens de production d’énergie. Elle en trace l’historique et présente les (…)
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