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Exciton spin relaxation in InAs/InGaAlAs/InP(001) quantum dashes emitting near 1.55 {\mu}m

Authors :
Syperek, M.
Dusanowski, Ł.
Gawełczyk, M.
Sęk, G.
Somers, A.
Reithmaier, J. P.
Höfling, S.
Misiewicz, J.
Source :
Appl. Phys. Lett. 109, 193108 (2016)
Publication Year :
2018

Abstract

Exciton spin and related optical polarization in self-assembled InAs/In$_{0.53}$Ga$_{0.23}$Al$_{0.24}$As/InP(001) quantum dashes emitting at 1.55 {\mu}m are investigated by means of polarization- and time-resolved photoluminescence, as well as photoluminescence excitation spectroscopy, at cryogenic temperature. We investigate the influence of highly non-resonant and quasi-resonant optical spin pumping conditions on spin polarization and spin memory of the quantum dash ground state. We show that a spin pumping scheme, utilizing the longitudinal-optical-phonon-mediated coherent scattering process, can lead to the polarization degree above 50%. We discuss the role of intrinsic asymmetries in the quantum dash that influence values of the degree of polarization and its time evolution.<br />Comment: 4 pages, 3 figures

Details

Database :
arXiv
Journal :
Appl. Phys. Lett. 109, 193108 (2016)
Publication Type :
Report
Accession number :
edsarx.1807.09143
Document Type :
Working Paper
Full Text :
https://doi.org/10.1063/1.4966997