Evidence of strong phonon-assisted resonant intervalley up-transfer for electroncs in type-II GaAs/AIAs superlattices

Xiaodong Mu; Yujie J. Ding; Zhiming Wang; Gregory J. Salamo

doi:10.1117/12.529066

16 June 2004 Evidence of strong phonon-assisted resonant intervalley up-transfer for electroncs in type-II GaAs/AIAs superlattices

Xiaodong Mu, Yujie J. Ding, Zhiming Wang, Gregory J. Salamo

Author Affiliations +

Proceedings Volume 5352, Ultrafast Phenomena in Semiconductors and Nanostructure Materials VIII; (2004) https://doi.org/10.1117/12.529066
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

Abstract

We demonstrate that longitudinal-optical (LO) phonons efficiently pump electrons from the quasi-X states to the quasi-Γ states in short-period type-II GaAs/AlAs superlattices. At a very low temperature, the phonon-assisted electron up-transfer can occur if the energy difference between the lowest quasi-Γ states and quasi-X states is equal to or less than the LO phonon energies. As the temperature increases, however, kinetic energies of the electrons can facilitate the electron up-transfer. As a result, we have observed peculiar behaviors on these superlattices. First, photoluminescence intensity for the quasi-direct transition drastically increases as the temperature or pump power increases. Second, the dependence of the integrated photoluminescence intensity on the pump power exhibits a square power law.

Citation Download Citation

Xiaodong Mu, Yujie J. Ding, Zhiming Wang, and Gregory J. Salamo "Evidence of strong phonon-assisted resonant intervalley up-transfer for electroncs in type-II GaAs/AIAs superlattices", Proc. SPIE 5352, Ultrafast Phenomena in Semiconductors and Nanostructure Materials VIII, (16 June 2004); https://doi.org/10.1117/12.529066

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