Temperature-insensitive optical alignment of the exciton in nanowire-embedded GaN quantum dots

A. Balocchi, J. Renard, C. T. Nguyen, B. Gayral, T. Amand, H. Mariette, B. Daudin, G. Tourbot, and X. Marie

Phys. Rev. B 84, 235310 – Published 15 December 2011

Abstract

We report on the exciton spin dynamics of nanowire-embedded GaN/AlN quantum dots (QDs) investigated by time-resolved photoluminescence spectroscopy. Under a linearly polarized quasiresonant excitation, we evidence the quenching of the exciton spin relaxation and a temperature-insensitive degree of the exciton linear polarization, demonstrating the robustness of the optical alignment of the exciton spin in these nanowire-embedded QDs. A detailed examination of the luminescence polarization angular dependence shows orthogonal linear exciton eigenstates.

Received 13 July 2011

DOI:https://doi.org/10.1103/PhysRevB.84.235310

Authors & Affiliations

A. Balocchi^1,*, J. Renard^2,3, C. T. Nguyen¹, B. Gayral³, T. Amand¹, H. Mariette³, B. Daudin³, G. Tourbot^3,4, and X. Marie¹

¹Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 avenue de Rangueil, F-31077 Toulouse, France
²Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
³CEA-CNRS group “Nanophysique et semiconducteurs,”CEA-Grenoble, INAC-SP2M and CNRS-Institut Néel, rue des martyrs, F-38054 Grenoble, France
⁴CEA-LETI Minatec, 17 rue des martyrs, F-38054 Grenoble, France

^*andrea.balocchi@insa-toulouse.fr

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Vol. 84, Iss. 23 — 15 December 2011

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