Light-induced nuclear quadrupolar relaxation in semiconductorsReportar como inadecuado

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* Corresponding author 1 LPMC - Laboratoire de physique de la matière condensée 2 LPCNO - Laboratoire de physique et chimie des nano-objets

Abstract : Light excitation of a semiconductor, known to dynamically-polarize the nuclear spins by hyperfine contact interaction with the photoelectrons, also generates an intrinsic nuclear depolarization mechanism. This novel relaxation process arises from the modulation of the nuclear quadrupolar Hamiltonian by photoelectron trapping and recombination at nearby localized states. For nuclei near shallow donors, the usual diffusion radius is replaced by a smaller, quadrupolar, radius. If the light excitation conditions correspond to partial donor occupation by photoelectrons, the nuclear magnetization and the nuclear field can be decreased by more than one order of magnitude.

Mots-clés : relaxation de spin nucléaire pompage optique luminescence semi-conducteurs

Autor: Daniel Paget - Thierry Amand - J.P. Korb -



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