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Spin dynamics of ZnSe-ZnTe nanostructures grown by migration enhanced molecular beam epitaxy

Deligiannakis, V; Dhomkar, S; Ji, H; Pagliero, D; Kuskovsky, IL; Meriles, CA; Tamargo, MC; (2017) Spin dynamics of ZnSe-ZnTe nanostructures grown by migration enhanced molecular beam epitaxy. Journal of Applied Physics , 121 (11) , Article 115702. 10.1063/1.4978314. Green open access

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Abstract

We study the spin dynamics of ZnSe layers with embedded type-II ZnTe quantum dots using time resolved Kerr rotation (TRKR). Three samples were grown with an increasing amount of Te, which correlates with increased quantum dot (QD) density. Samples with a higher quantum dot density exhibit longer electron spin lifetimes, up to 1 ns at low temperatures. Tellurium isoelectronic centers, which form in the ZnSe spacer regions as a result of the growth conditions, were probed via spectrally dependent TRKR. Temperature dependent TRKR results show that samples with high QD density are not affected by an electron-hole exchange dephasing mechanism.

Type: Article
Title: Spin dynamics of ZnSe-ZnTe nanostructures grown by migration enhanced molecular beam epitaxy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4978314
Publisher version: http://doi.org/10.1063/1.4978314
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.
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: http://discovery.ucl.ac.uk/id/eprint/10054020
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