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Titolo:
MAGNETOOPTICAL STUDIES OF THE TYPE-I TYPE-II CROSSOVER AND BAND-OFFSET IN ZNTE ZN1-2MNXTE SUPERLATTICES IN MAGNETIC-FIELDS UP TO 45 T/
Autore:
CHENG HH; NICHOLAS RJ; LAWLESS MJ; ASHENFORD DE; LUNN B;
Indirizzi:
UNIV OXFORD,DEPT PHYS,CLARENDON LAB,PKS RD OXFORD OX1 3PU ENGLAND UNIV HULL,DEPT ENGN DESIGN & MANUFACTURE KINGSTON HULL HU6 7RX N HUMBERSIDE ENGLAND
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 7, volume: 52, anno: 1995,
pagine: 5269 - 5274
SICI:
0163-1829(1995)52:7<5269:MSOTTT>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUANTUM-WELLS; DIAMAGNETIC SHIFT; CDTE (CD,MN)TE; EXCITONS; ZN1-XMNXTE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
H.H. Cheng et al., "MAGNETOOPTICAL STUDIES OF THE TYPE-I TYPE-II CROSSOVER AND BAND-OFFSET IN ZNTE ZN1-2MNXTE SUPERLATTICES IN MAGNETIC-FIELDS UP TO 45 T/", Physical review. B, Condensed matter, 52(7), 1995, pp. 5269-5274

Abstract

We report measurements of magnetoreflectivity in ZnTe/Zn1-xMnxTe superlattices with varying well width in magnetic fields up to 45 T. From an analysis of the Zeeman splitting, we investigate the change of bandalignment with field and the band offset ratio. A crossing of the is exciton transitions from the ZnTe buffer layer and the 1s heavy hole sigma(+) exciton of the superlattice is observed, providing unambiguousevidence of a band alignment change from type I to type II. The excitonic energy levels for both type-I and type-II band structure are calculated using a variational method. This model fits the experimental data very well at high fields for both sigma(+) and sigma(-) transitionsand predicts that the type-I/type-II crossover occurs at 2-3 T. Also by fitting the sigma(+) transition energy as a function of held a conduction band offset ratio of Delta E(c)/Delta E(g)=0.72+/-0.04 is deduced.

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Documento generato il 05/04/20 alle ore 17:58:34