Observation of bulk-like LO phonons in GaAs/AlxGa1-xAs superlattices and quantum wells

Abdellatif Bouchalkha; D. S. Kim; Jin-Joo Song; John F. Klem

doi:10.1117/12.137636

3 September 1992 Observation of bulk-like LO phonons in GaAs/Al_xGa_1-xAs superlattices and quantum wells

Abdellatif Bouchalkha, D. S. Kim, Jin-Joo Song, John F. Klem

Proceedings Volume 1675, Quantum Well and Superlattice Physics IV; (1992) https://doi.org/10.1117/12.137636
Event: Semiconductors '92, 1992, Somerset, NJ, United States

Abstract

Picosecond pulses are used to measure the hot phonon generation rate ((partial)N_q/(partial)t) of Raman active GaAs LO phonons in several GaAs/Al_xGa_1-xAs superlattices (SL's) and quantum wells (QW's). Drastic increase in (partial)N_q/(partial)t is observed as the barrier width (L_b) decreased below a critical value for SL's with x >= 0.4. This is interpreted as due to a phonon transition from confinement to propagation. In contrast, for x b's considered. We have also observed the existence of a critical x equals x₀ below which the LO phonons are no longer confined. Estimate of the LO phonon penetration depth into the barriers are also obtained for the different x values.

Citation Download Citation

Abdellatif Bouchalkha, D. S. Kim, Jin-Joo Song, and John F. Klem "Observation of bulk-like LO phonons in GaAs/Al_xGa_1-xAs superlattices and quantum wells", Proc. SPIE 1675, Quantum Well and Superlattice Physics IV, (3 September 1992); https://doi.org/10.1117/12.137636

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