Exciton spin relaxation in InAs/InGaAlAs/InP(001) quantum dashes emitting near 1.55 μm
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Exciton spin and related optical polarization in self-assembled InAs/In0.53Ga0.23Al0.24As/InP(001) quantum dashes emitting at 1.55 μm 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.
Syperek , M , Dusanowski , Ł , Gawełczyk , M , Sęk , G , Somers , A , Reithmaier , J P , Höfling , S & Misiewicz , J 2016 , ' Exciton spin relaxation in InAs/InGaAlAs/InP(001) quantum dashes emitting near 1.55 μ m ' , Applied Physics Letters , vol. 109 , no. 19 , 193108 . https://doi.org/10.1063/1.4966997
Applied Physics Letters
Copyright © 2016, the Author(s). Published by AIP Publishing. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1063/1.4966997
DescriptionThis research was supported by The National Science Center Grant MAESTRO No. 2011/02/A/ST3/00152. Ł. D. acknowledges the financial support from the Foundation for Polish Science within the START fellowship.
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