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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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30 July 2018

Polarized luminescence of Anistropic LaPo4 Eu Nanocrystal Polymorphs

Among the various types of phosphors, lanthanides perform the most informative luminescence spectra identifying the chemical structure of the host material. However, there is a disconnection (...)

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2 July 2018

MOMENTOM workshop "Disruptive materials for the electrochemical energy storage" at Polytechnique.

MOMENTOM (MOlecules and Materials for the ENergy of TOMorrow) is a research program of Paris-Saclay University, structured in 4 "challenges". The workshop held on June 28 was organized in the (...)

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18 May 2018

50 years of Optical Orientation in Semiconductors

In 1968, optical spin orientation in semiconductors was discovered by Georges Lampel at Ecole polytechnique. The symposium will celebrate fifty years of prolific research on the spin physics in (...)

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23 February 2018

Anderson localization by the alloy disorder in nitride semiconductor devices: the ELENID project funded by the ANR.

Semiconductor devices incorporate alloys that exhibit intrinsic compositional disorder. In nitride-based compounds, because of the large variation of the band gap energy with the composition, the (...)

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9 January 2018

PhD award of University of Paris-Saclay

Marco Piccardo has received the PhD award “Innovative Materials and Applications” for his thesis at Ecole Polytechnique entitled “Spectroscopy of photoelectric processes in III-N structures and (...)

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