ORCID Profile
0000-0001-9813-723X
Current Organisation
Institute of Physics
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Publisher: AIP Publishing
Date: 10-2010
DOI: 10.1063/1.3493047
Abstract: Room temperature electronic diffusion is studied in 3 μm 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 both the charge (L) and spin (Ls) diffusion lengths simultaneously. The measured values of L and Ls are in excellent agreement with the spatially averaged polarization and a sharp reduction in these two quantities (L from 21.3 to 1.2 μm and Ls from 1.3 to 0.8 μm) is found with increasing surface recombination velocity. Outward diffusion results in a factor of 10 increase in the polarization at the excitation spot. The range of materials to which the technique can be applied, as well as a comparison with other existing methods for the measurement of spin diffusion, is discussed.
Publisher: AIP Publishing
Date: 05-2010
DOI: 10.1063/1.3374641
Abstract: Local spin injectors using GaAs tips at the end of transparent cantilevers have been fabricated using a combination of epitaxial growth, etching processes and photolithographic techniques. The tip luminescence polarization is found to be small because of total internal light reflections of the luminescence inside the tip. However, measurements on planar films of similar doping along with a numerical solution of the spin and charge diffusion equations indicate that the injected spin polarization can be as high as 40% with corresponding electronic concentrations at the tip apex of the order of 1014 cm−3.
Publisher: American Physical Society (APS)
Date: 10-03-2011
Publisher: IOP Publishing
Date: 18-01-2010
Publisher: Elsevier BV
Date: 2010
Publisher: American Physical Society (APS)
Date: 29-09-2010
Publisher: Elsevier BV
Date: 06-2012
No related grants have been discovered for DUONG VU.