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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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16 September 2026
new publication of Thomas Philippe-Journal of the American Chemical Society
Understanding crystallization from solution is essential to natural and industrial processes. In contrast to the (…)
16 June 2026
On June 12, 2026, Thomas Philippe successfully defended his Habilitation à Diriger des Recherches (HDR), entitled Dynamics of First-Order Phase Transitions: Bulk and Interfacial Phase Separation. (…)
1 June 2026
From june 1st through 24th Tamas Pusztai will be at PMC as a visitng scientist, financed by the DER of Ecole polytechnique. Tamas works at the Wigner Research Center for Physics in Budapest (…)
29 April 2026
The nucleation and growth mechanisms at play during the synthesis of nanoparticles by physical or chemical processes do not strongly differ. Moreover, the nanoparticle reactivity towards an (…)
19 January 2026
When vapor nucleates into liquid, the critical droplets break a key assumption of classical nucleation theory (CNT). CNT assumes that critical droplets have the same density as the final liquid—an (…)
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