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Optical anisotropy in type-II ZnTe/ZnSe submonolayer quantum dots

Ji, H; Dhomkar, S; Wu, R; Shuvayev, V; Deligiannakis, V; Tamargo, MC; Ludwig, J; ... Kuskovsky, IL; + view all (2016) Optical anisotropy in type-II ZnTe/ZnSe submonolayer quantum dots. Journal of Applied Physics , 119 (22) , Article 224306. 10.1063/1.4953675. Green open access

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Abstract

Linearly polarized photoluminescence is observed for type-II ZnTe/ZnSe submonolayer quantum dots (QDs). The comparison of spectral dependence of the degree of linear polarization (DLP) among four samples indicates that the optical anisotropy is mostly related to the elongation of ZnTe QDs. Numerical calculations based on the occupation probabilities of holes in px and py orbitals are performed to estimate the lateral aspect ratio of the QDs, and it is shown that it varies between 1.1 and 1.4. The value of anisotropic exchange splitting for bright excitonic states is found to be ∼200 μeV from the measurement of the degree of circular polarization as a function of the magnetic field. The results also show that heavy-light hole mixing ratio is about 0.16.

Type: Article
Title: Optical anisotropy in type-II ZnTe/ZnSe submonolayer quantum dots
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4953675
Publisher version: https://doi.org/10.1063/1.4953675
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10053973
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