Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-07-06
Rev. Sci. Instr. 81, 103902 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 3 figures
Scientific paper
10.1063/1.3493047
Room temperature electronic diffusion is studied in 3 mum thick epitaxial p+ GaAs lift-off films using a novel circularly polarized photoluminescence microscope. The method is equivalent to using a standard optical microscope and provides a contactless means to measure charge (L) and spin (L_s) diffusion lengths. The measured values of L and L_s are in excellent agreement with the spatially averaged polarization and a sharp reduction in these two quantities (L from 21.3 mum to 1.2 mum and L_s from 1.3 mum to 0.8 mum) is measured with increasing surface recombination. Outwards diffusion results in a factor of 10 increase in the polarization at the excitation spot.
Arscott Steve
Favorskiy I.
Paget Daniel
Peytavit Emilien
Rowe Alistair C. H.
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