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Titolo:
MAGNETOOPTICAL STUDY OF EXCITONIC BINDING-ENERGIES, BAND OFFSETS, ANDTHE ROLE OF INTERFACE POTENTIALS IN CDTE CD1-XMNXTE MULTIPLE-QUANTUM WELLS/
Autore:
JACKSON SR; NICHOLLS JE; HAGSTON WE; HARRISON P; STIRNER T; HOGG JHC; LUNN B; ASHENFORD DE;
Indirizzi:
UNIV HULL,DEPT APPL PHYS KINGSTON HULL HU6 7RX N HUMBERSIDE ENGLAND UNIV HULL,DEPT ENGN DESIGN & MFG KINGSTON HULL HU6 7RX N HUMBERSIDE ENGLAND
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 8, volume: 50, anno: 1994,
pagine: 5392 - 5403
SICI:
0163-1829(1994)50:8<5392:MSOEBB>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
II TRANSITION; CDTE; SUPERLATTICES; BARRIERS; SYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
S.R. Jackson et al., "MAGNETOOPTICAL STUDY OF EXCITONIC BINDING-ENERGIES, BAND OFFSETS, ANDTHE ROLE OF INTERFACE POTENTIALS IN CDTE CD1-XMNXTE MULTIPLE-QUANTUM WELLS/", Physical review. B, Condensed matter, 50(8), 1994, pp. 5392-5403

Abstract

Magneto-optical studies on a series of CdTe/Cd1-xMn(x)Te multiple-quantum-well structures with x congruent-to 0.08 have identified the 1S and 2S states of both the light- and heavy-hole n = 1 excitons. This has allowed changes of the exciton binding energies to be studied as a function of the depth of the confining potentials, which were tuned through the sp3-d exchange interaction in the barrier layers by application of a magnetic field. Calculations of these binding energies by a variational technique are in general agreement with the observations. The exchange-induced splitting of the heavy-hole exciton is found to be consistent with between 0.35 and 0.45 of the band offset being in the valence band, which accounts for the absence of any evidence that the valence-band structure changes from a type-I structure to a type-II structure above a certain value of a magnetic field. However, this offset is found to be too large to account for the exchange-induced splitting of the light-hole exciton, which appears to be anomalously large. Calculations have shown that this anomaly cannot be explained in terms of the diffusion of Mn ions from the barrier regions into the wells. An alternative explanation is given in terms of field-dependent interface potentials wherein the sp3-d exchange interaction is considered to be different in the interface regions of the multiple quantum wells tothat in the barrier regions.

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Documento generato il 08/04/20 alle ore 11:43:47