In:
Applied Physics Letters, AIP Publishing, Vol. 71, No. 6 ( 1997-08-11), p. 788-790
Abstract:
We report a direct measurement of the hole relaxation time in undoped CdTe/CdMnTe quantum wells. The internal piezoelectric field in a (111)-grown structure is screened by e1h1 and e1h2 excitons with different efficiency. Thus, the temporal evolution of the screened field, as monitored by the e1h1 exciton energy in a pump-probe transmission experiment, allows the determination of the e1h2−e1h1 relaxation time. We obtained a relaxation time of 15±5 ps for a splitting of 15 meV, smaller than the longitudinal-optical (LO) phonon energy. Deformation-potential scattering is too slow to explain this relaxation time which we attribute to hole-hole scattering and LO-phonon emission by e1h2 excitons acquiring enough kinetic energy.
Type of Medium:
Online Resource
ISSN:
0003-6951
,
1077-3118
Language:
English
Publisher:
AIP Publishing
Publication Date:
1997
detail.hit.zdb_id:
211245-0
detail.hit.zdb_id:
1469436-0
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