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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 September 2021
Femtosecond light-induced phase transitions between different macroscopic orders offer the possibility of adjusting the functional properties of condensed matter on ultra-fast time scales. In (...)
25 May 2021
Guillaume Graciani did his thesis from September 2017 to October 2020 under the joint supervision of François Amblard at UNIST (Ulsan, South Korea), and Marcel Filoche at École polytechnique. He (...)
16 February 2021
During a cooling failure in a nuclear power plant, corium - a metallic and mineral magma in the core of the reactor - is likely to cause contamination of the external environment. To prevent (...)
15 January 2021
During a severe nuclear accident, due to the loss of cooling, the reactor core can melt. This results in the build up of a liquid mixture made of uranium and the metallic component of the (...)
3 November 2020
In collaboration with the Theory group of LSI and experiments performed at the Swiss Light Source we have studied angular resolved satellites in valence band photoelectron spectroscopy. (...)
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