Deterministic optical polarisation in nitride quantum dots at thermoelectrically cooled temperatures

Thumbnail Image
3960.pdf(1.39 MB)
Published Version
Wang, Tong
Puchtler, Tim J.
Patra, Saroj K.
Zhu, Tongtong
Jarman, John C.
Oliver, Rachel A.
Schulz, Stefan
Taylor, Robert A.
Journal Title
Journal ISSN
Volume Title
Nature Publishing Group
Research Projects
Organizational Units
Journal Issue
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.
Quantum dots , Quantum optics
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