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(a) Schematic illustration of our experiment setup. (b) Experimental sequence of thermal annealing and laser irradiation for solid-phase formation of MnAs nanoparticles in a GaAs matrix. (c) Representative transmission electron microscopy image of a sample which was annealed under laser irradiation with a wavelength of 671 nm and a photon flux of 4 × 1018 cm−2 s−1.
(a) Sample number, and corresponding laser wavelength and photon flux. (b) Particle diameter (D) distribution of sample 1 (annealed without laser irradiation.) (c)-(f) Particle diameter distributions of samples 2-5 (irradiated by laser light with wavelength λ = 1500, 850, 671, and 532 nm, respectively.) Solid curves are Gaussian fittings.
Photon energy (E) dependence of (a) the normalized peak height and (b) the median diameters D 1 and D 2 of peak I (D ∼ 2–3 nm) and peak II (D ∼ 7 nm), respectively. Filled circles and rectangles are data of peak I and peak II for samples 2-5, respectively. Blank circles and rectangles are the data of sample 1 with a defined “background” photon energy of 0.45 eV corresponding to the peak of the black-body radiation spectrum of the heater (1050 K). Dashed lines in (a) are guides for the eyes. Solid line in (b) shows the relationship D 1 ∼ E −1/5.
DOS of a cubic-shaped nanoparticle with size of L (inset) and large surface potential (see Ref. 21). DOS shows periodic delta-function-like peaks. The intersubband electronic transition energy between these peaks ΔE Peak can explain our experimental results.
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