2012
DOI: 10.1142/s0129156412500012
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LÉVY FLIGHT OF HOLES IN InP SEMICONDUCTOR SCINTILLATOR

Abstract: also seem to follow Lévy flights when foraging [11]. Finally, a vast literature is devoted to Lévy flights in finance, "random walk down the Street" [12].Nevertheless, there have been preciously few experimentally available laboratory systems for studying LF transport, ideally with variable parameters. A rather ingenious such system was recently demonstrated by Barthelemy et al. [13], who embedded scattering particles in a glass matrix -together with non-scattering glass microspheres of same refractive index a… Show more

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Cited by 12 publications
(37 citation statements)
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References 28 publications
(68 reference statements)
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“…1 together with the calculated spectrum. Also shown is the luminescence spectrum, observed from the broadside in reflection geometry [8,9]. We note that, compared to the reflection spectrum, the edge-excitation spectrum is noticeably shifted to the red side, indicating substantial filtering [7].…”
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confidence: 91%
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“…1 together with the calculated spectrum. Also shown is the luminescence spectrum, observed from the broadside in reflection geometry [8,9]. We note that, compared to the reflection spectrum, the edge-excitation spectrum is noticeably shifted to the red side, indicating substantial filtering [7].…”
mentioning
confidence: 91%
“…In the normal transport process, the stationary distribution of minority carriers produced by optical excitation in semiconductors decays exponentially from the excitation area and is characterized by a micron-scale diffusion length l. However, in moderately-doped direct-gap semiconductors with high radiative efficiency, the minoritycarrier transport is strongly modified by the "photon recycling" process (repeated radiative recombination and reabsorption of emerging photons). The distribution of steps in this photon-mediated random walk of minority carriers is defined by the photon reabsorption probability [7] and the single-step probability distribution P(x) can be calculated from the interband absorption and radiative recombination spectra [8].…”
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confidence: 99%
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“…Still dealing with material issues, also photoluminescence experiments in moderately doped n-InP samples reveal anomalous Lévy-type distribution [12][13][14][15][16][17]. This phenomenon could have a large impact on the design of a number of optoelectronic devices such as multicolored LEDs, opto-thyristors, photovoltaic devices with high efficiency, or semiconductor scintillator for radiation detection [16].…”
Section: Introductionmentioning
confidence: 99%
“…Fortunately, in crystals with high quantum efficiency of emission we find a way of avoiding this difficulty, based on the giant spread of the minority carriers in the sample. The minority carrier distribution is strongly modified by the recycling effects (multiple emission-reabsorption events) [18,19,20]. When the losses of carriers (via non-radiative recombination) and photons (via residual free-carrier absorption) are low, the recycling leads to anomalous diffusion and a dramatic increase of the minoritycarrier spread in the sample (up to centimeter-scale distances) [17].…”
Section: Introductionmentioning
confidence: 99%