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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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18 February 2019

La naissance miraculeuse des flocons de neige

Par Tristan Vey
La diversité et la complexité des flocons de neige fascinent depuis longtemps les physiciens qui n’ont pas encore levé tous les mystères de leur formation. La neige qui tombe (...)

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31 January 2019

Modifying silicon’s surface electronic properties with mechanical stress

Mechanical stress is widely used in strained-silicon technologies to improve the performance of microelectronic devices. This relies on the fact that stress can be used to modify the so-called (...)

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19 December 2018

Revealing spin-valley dynamics in 2D semiconductors: the SpinCAT project funded by the ANR

The roadmap of future innovative device developments foresees the reduction of material dimensions down to nanometer scale and the incorporation of 2D compounds with novel degrees of freedom (...)

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22 November 2018

Wiebke Hahn winner of the student award for her talk at IWN 2018

Wiebke Hahn, PhD student in the Electrons-Photons-Surfaces group, wins the student award for her oral presentation at the 10th International Workshop on Nitride Semiconductors 2018 in Kanazawa, (...)

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19 November 2018

"poster prize" from the Innovative Materials and Applications pole

Jeongmo KIM, PhD student at the chemistry group of PMC Laboratory received the "poster prize" from the Innovative Materials and Applications pole at the day of the Interfaces doctoral school on (...)

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