Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
71 (1997), S. 788-790
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
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. © 1997 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.119646
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