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Optical response from terahertz to visible light of electronuclear transitions in LiYF4:Ho3+

Matmon, G; Lynch, S; Fisher, A; Aeppli, G; Rosenbaum, TF; (2016) Optical response from terahertz to visible light of electronuclear transitions in LiYF4:Ho3+. Physical Review B - Condensed Matter and Materials Physics , 94 (20) , Article 205132. 10.1103/PhysRevB.94.205132. Green open access

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Abstract

Because of its role as a model system with tunable quantum fluctuations and quenched disorder, and the desire for optical control and readout of its states, we have used high-resolution optical absorption spectroscopy to measure the crystal-field excitations for Ho3+ ions in LiHoxY1−xF4 from the terahertz to visible regimes. We show that many of the excitations yield very narrow lines visibly split even by the nuclear hyperfine interaction, making Ho3+ in LiHoxY1−xF4 a candidate host for optically addressable electronuclear qubits with quality factors as high as Q=4.7×105, where the higher-lying levels are electronic singlets. Optical transitions in the easily accessible near- and mid-infrared are narrow enough to allow readout of the ground-state electronuclear qubits responsible for the interesting magnetism of LiHoxY1−xF4. While many of the higher-lying states have been observed previously, we also report here detailed spectra of terahertz excitations. The strengths of the electric and magnetic dipole crystal-field transition lines of five of the lowest excited spin-orbit manifolds of dilute LiYF4:Ho3+ were calculated and compared with measurement. The magnitude of the nuclear hyperfine coupling was used to assign the correct upper and lower states to transition lines.

Type: Article
Title: Optical response from terahertz to visible light of electronuclear transitions in LiYF4:Ho3+
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.94.205132
Publisher version: http://dx.doi.org/10.1103/PhysRevB.94.205132
Language: English
Additional information: Copyright © 2016 American Physical Society.
Keywords: Hyperfine interaction, Crystal field, THz, FTIR spectroscopy
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 > Dept of Physics and Astronomy
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/1530089
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