Deterministic optical polarisation in nitride quantum dots at thermoelectrically cooled temperatures

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Date
2017-09-21
Authors
Wang, Tong
Puchtler, Tim J.
Patra, Saroj K.
Zhu, Tongtong
Jarman, John C.
Oliver, Rachel A.
Schulz, Stefan
Taylor, Robert A.
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Nature Publishing Group
Published Version
10.1038/s41598-017-12233-6
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Abstract
We report the successful realisation of intrinsic optical polarisation control by growth, in solid-state quantum dots in the thermoelectrically cooled temperature regime (≥200 K), using a non-polar InGaN system. With statistically significant experimental data from cryogenic to high temperatures, we show that the average polarisation degree of such a system remains constant at around 0.90, below 100 K, and decreases very slowly at higher temperatures until reaching 0.77 at 200 K, with an unchanged polarisation axis determined by the material crystallography. A combination of Fermi-Dirac statistics and k·p theory with consideration of quantum dot anisotropy allows us to elucidate the origin of the robust, almost temperature-insensitive polarisation properties of this system from a fundamental perspective, producing results in very good agreement with the experimental findings. This work demonstrates that optical polarisation control can be achieved in solid-state quantum dots at thermoelectrically cooled temperatures, thereby opening the possibility of polarisation-based quantum dot applications in on-chip conditions.
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Keywords
Quantum dots , Quantum optics
Citation
Wang, T., Puchtler, T. J., Patra, S. K., Zhu, T., Jarman, J. C., Oliver, R. A., Schulz, S. and Taylor, R. A. (2017) 'Deterministic optical polarisation in nitride quantum dots at thermoelectrically cooled temperatures', Scientific Reports, 7, 12067 (9pp). doi: 10.1038/s41598-017-12233-6
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https://www.nature.com/articles/s41598-017-12233-6
URI
https://hdl.handle.net/10468/5137
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Tyndall National Institute - Journal Articles
Electrical and Electronic Engineering - Journal Articles
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© 2017, the Authors 2017. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.