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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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2 July 2018
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 (...)
18 May 2018
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 (...)
23 February 2018
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, (...)
9 January 2018
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 (...)
17 December 2017
The development of new biotechnologies is tightly bound to our understanding of biological systems and our capacity to efficiently integrate biomolecules such as redox enzymes in electronic (...)
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