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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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13 September 2021

Imaging Seebeck drift of charged excitons in 2D materials

A recently published work from the “Electrons Photons Surfaces” group explores the peculiar transport properties of excitons in novel, atomically thin 2D semiconductors. A polarized hyperspectral (...)

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13 September 2021

Efficient optical manipulation of spin and valley in 2D semiconductors

One of the most promising properties of novel 2D semiconductors based on transition metal dichalcogenides are related to the possibility of manipulating the spin and valley (momentum) degree of (...)

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1 September 2021

Subpicosecond metamagnetic phase transition in FeRh driven by non-equilibrium electron dynamics

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 (...)

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25 May 2021

Guillaume Graciani, IP Paris Thesis Award

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 (...)

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16 February 2021

A nuclear safety issue: modeling corium fusion

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 (...)

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