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Far-infrared emission by resonant-polaron effects in narrow-band-gap Hg(1-x)Cd(x)Te

Fern-Infrarot-Absorption durch resonante Polaronen in Hg(1-x)Cd(x)Te mit kleinem Bandabstand
: Fuchs, F.; Schneider, H.; Schwarz, K.; Walcher, H.; Triboulet, R.; Koidl, P.


Physical review letters 67 (1991), Nr.10, S.1310-1313 : Abb.,Lit.
ISSN: 0031-9007
Fraunhofer IAF ()
far infrared; fernes Infrarot; Fourier spectroscopy; Fourier-Spektroskopie; infrared luminescence; Infrarot-Lumineszenz; Polaron; Reststrahlen band; Reststrahlenbande

We report on the first experimental observation of far-infrared emission within the reststrahlen band of a semiconductor. We have performed Fourier-transform emission experiments on narrow-band-gap Hg1-xCdxTe (x is approximately equal to 0.17). Under Arhighplus-laser excitation, we find an emission spectrum at the longitudinal-optical-phonon energies of the material (137.5 and 157.5 cmhigh-1). The appearance of the optical emission signal is caused by interband polaron effects arising from the resonant matching between longitudinal-optical phonons and electron-hole excitations, as suggested in recent theoretical calculations.