Alhosiny, N. orcid.org/0000-0002-9347-4074, Alharthi, S.S. orcid.org/0000-0003-0601-1555, Doogan, J. orcid.org/0009-0008-4911-0581 et al. (2 more authors) (2025) Optimizing spin polarization in quantum dot vertical-gain structures through pump wavelength selection. Applied Physics Letters, 126 (19). 191102. ISSN 0003-6951
Abstract
Spintronic applications require an efficient injection of spin-polarized carriers. We study the maximally achievable spin polarization in InAs quantum dots in a vertical-cavity gain structure to be used in telecoms-wavelength vertical-external-cavity surface-emitting lasers via measurement of the Stokes parameter of the photoluminescence emission around 1290 nm. Using five pump wavelengths between 850 and 1070 nm, the observed spin polarization depends strongly on the pump wavelength with the highest polarization of nearly 5% found for excitation at 980 nm. This corresponds to an effective spin lifetime of 40 ps and is attributed to the dominant excitation of heavy holes only.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2025 Najm Alhosiny, Sami S. Alharthi, J. Doogan, E. Clarke, and T. Ackemann. Except as otherwise noted, this author-accepted version of a journal article published in Applied Physics Letters is distributed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC BY-NC-ND) License. (https://creativecommons.org/licenses/by-nc-nd/4.0/) |
Keywords: | Quantum Physics; Physical Sciences; Condensed Matter Physics |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > School of Electrical and Electronic Engineering |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 22 May 2025 15:49 |
Last Modified: | 22 May 2025 23:00 |
Status: | Published |
Publisher: | AIP Publishing |
Refereed: | Yes |
Identification Number: | 10.1063/5.0261768 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:227041 |