Condensed Matter Physics Seminar
Thursday, October 29, 1998, 3 p.m.
Physics Building, Room 1402
Magneto-optical study of low-dimensional excitons in semiconductors
in high magnetic fields
Noboru Miura
(Institute for Solid State Physics, University of Tokyo, Japan)
Abstract: We present the recent results of the magneto-optical spectroscopy
of low dimensional excitons in quantum wells (QWs), short period superlattices
(SLs), quantum wires (QWRs) and quantum dots (QDs) in pulsed high magnetic
fields produced by three different techniques, electromagnetic flux compression
(up to 500T), the single-turn coil technique (up to 200T) and nondestructive
long pulse magnets (up to 50T). Many different kinds of anomalous behaviors
and unusual magnetic field effects were observed in very high magnetic
fields. The topics to be discussed are: the exciton spectra in GaAs/AlAs
QWs under ultrahigh magnetic fields up to 450T, anomalous magnetic field
effect in GaP/AlP short period SLs, anomalies in the diamagnetic shift
and the splitting of exciton lines in CdTe/CdMgTe QWs in the fractional
quantum Hall regime, and the diamagnetic shift and the coupling of QWRs
and QDs.
Host: Bob Anderson
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