Rare earths (REs) diluted into MBE grown and synthesised n-type InP samples create an acceptor-like level (at 30 meV for Yb and 60 meV for Er) below the conduction band; the activation energies are deduced from temperature dependent Hall effect measurements. From EPR experiments where the authors observe resonance due to the Yb3+ ground state in n-type samples, they deduce that this acceptor-like level is not the Yb2+/Yb3+ acceptor level. They propose that the RE creates an attractive potential for electrons in III-V semiconductors. They discuss the consequences of this property for the luminescence excitation mechanism of the luminescence.
We report the molecular beam epitaxy growth of (Al) GaAsSb/AlAsSb Bragg reflectors around the 1.55 μm wavelength region. Mirrors with 96% reflectivity have been achieved by using ten pairs of quarter wavelength layers. This demonstrates the capability of the (Al) GaAsSb/AlAsSb system to achieve efficient Bragg mirrors lattice matched to InP substrates.
H. LANGLOIS et al. : Pouvoir rotatoire du cinabre (a-HgS) 821 phys. stat. sol. (b) 60, 821 (1973) Subject classification: 20.1; 13.1; 22.4.1 Centre National d'Etudes des TLliconzmunications, Bagneux ( a ) et Lannion (b) Pouvoir rotatoire du cinabre (a-HgS) Par H. LANGLOIS (a), B. AYRAULT (a), F. LEFIN (a) et Y. TOUDIC (b) Le pouvoir rotatoire du cinabre a 8th mesurh entre la bande interdite (1 x 0,6 pm) et 1 = 1 pm iL 300, 196,77,20 et 4 K. L'analyse des resultats montre que la dispersion rotatoire est mieux dhcrite par la formule de Drude (e = A/(L2 -a:)), dhduite d'un modhle a un oscillateur, que par celle de Chandrasekhar (e = A A2/(A2 -ddduite d'un modale A deux oscillateurs coupl6s. L'Btude en fonction de la temphrature montre qu'une meme transition est responsable de l'absorption fondamentale au voisinage de E, et de la dispersion rotatoire.The rotatory power of cinnabar has been measured between the band gap (1 z 0.6 Fm) and 1 = 1 pm a t 300, 196, 77, 20, and 4 I ( . The dispersion of the optical activity is better accounted for by a Drude formula (e = A / ( P -A:)) deduced from a one oscillator model, than by Chandrasekhar's one (p = A Az/(A2deduced from a two coupled oscillators model. The analysis of the data versus temperature shows that the same transition accounts as well for the absorption near the band gap as for the rotatory dispersion.
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