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Titolo:
Optical phonons in Pb1-xEuxTe epilayers and PbTe/EuTe superlattices: Berreman effect - art. no. 035316
Autore:
Aigle, M; Pascher, H; Kim, H; Tarhan, E; Mayur, AJ; Sciacca, MD; Ramdas, AK; Springholz, G; Bauer, G;
Indirizzi:
Univ Bayreuth, D-95440 Bayreuth, Germany Univ Bayreuth Bayreuth Germany D-95440 yreuth, D-95440 Bayreuth, Germany Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA Purdue Univ W LafayetteIN USA 47907 Dept Phys, W Lafayette, IN 47907 USA Univ Linz, Inst Halbleiterphys, A-4040 Linz, Austria Univ Linz Linz Austria A-4040 Inst Halbleiterphys, A-4040 Linz, Austria
Titolo Testata:
PHYSICAL REVIEW B
fascicolo: 3, volume: 6403, anno: 2001,
pagine: 5316 -
SICI:
0163-1829(20010715)6403:3<5316:OPIPEA>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-BEAM EPITAXY; HETEROSTRUCTURE DIODE-LASERS; GAAS-ALAS SUPERLATTICES; OBLIQUE-INCIDENCE; CHALCOGENIDES; SCATTERING; SPECTRA; EUTE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Aigle, M Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA Argonne Natl Lab Argonne IL USA 60439 rce, Argonne, IL 60439 USA
Citazione:
M. Aigle et al., "Optical phonons in Pb1-xEuxTe epilayers and PbTe/EuTe superlattices: Berreman effect - art. no. 035316", PHYS REV B, 6403(3), 2001, pp. 5316

Abstract

The frequencies of the zone-center optical phonons in Pb1-xEuxTe (0 less than or equal tox less than or equal to1) epilayers both grown by molecular beam epitaxy and of the confined optical phonons in PbTe/EuTe superlatticeshave been determined from the transmission minima in the far infrared. With radiation incident on the film normally, only the transverse optical (TO)phonons can be observed, whereas oblique incidence allows the appearance of the longitudinal optical (LO) phonons as well, due to the Berreman effect. The first-order infrared spectrum of Pb1-xEuxTe exhibits a pair of ''EuTe-like'' zone-center optical phonons originating in the localized mode of Euin PbTe and evolving into the LO-TO pair of EuTe; the LO modes appear onlyin the oblique Berreman geometry, the radiation being polarized in the plane of incidence. From a high-quality EuTe epilayer, the frequencies of the TO and the LO phonons at 5 K have been determined to be 109.5 cm(-1) and 147.2 cm(-1) respectively. The phonon dispersion for EuTe with finite wave vectors along [111] has been deduced from the confined TO and LO modes observed in (PbTe)(m)/(EuTe)(n) superlattices.

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Documento generato il 16/07/20 alle ore 19:58:12