Anomalous shift of the recombination energy in single asymmetric quantum wells

Fanyao Qu; N. O. Dantas; P. C. Morais

doi:10.1117/12.432619

9 July 2001 Anomalous shift of the recombination energy in single asymmetric quantum wells

Fanyao Qu, N. O. Dantas, P. C. Morais

Proceedings Volume 4283, Physics and Simulation of Optoelectronic Devices IX; (2001) https://doi.org/10.1117/12.432619
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

Abstract

Self-consistent numerical calculation and photoluminescence (PL) measurements have been used to investigate the temperature dependence of the optical Stark effect in n-doped GaAs/AlGaAs single asymmetry quantum wells (SAQWs), grown by molecular beam epitaxy. In the low-temperature regime (5 to 40 K) a remarkable blue shift (9.8 meV) is observed in the PL peak energy, as the optical excitation intensity increases from 0.03 to 90 W/cm2. The blue shift is well explained by the reduction of the two-dimensional electron gas (2DEG) density, due to the charge-transfer mechanism. At about 80 K, however, an anomalous behavior of the PL peak energy was found, i.e. a red shift has been observed as the optical excitation intensity increases. This anomalous behavior has been explained by combining the effects of band gap renormalization, band bending, temperature dependence of the band gap, temperature dependence of the 2DEG density, and temperature dependence of the fundamental energy position.

Citation Download Citation

Fanyao Qu, N. O. Dantas, and P. C. Morais "Anomalous shift of the recombination energy in single asymmetric quantum wells", Proc. SPIE 4283, Physics and Simulation of Optoelectronic Devices IX, (9 July 2001); https://doi.org/10.1117/12.432619

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