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Proceedings Paper

Electron spin resonance spectroscopy of high purity crystals at millikelvin temperatures
Author(s): Warrick G. Farr; Daniel L. Creedon; Maxim Goryachev; Karim Benmessai; Michael E. Tobar
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Paper Abstract

Progress in the emerging field of engineered quantum systems requires the development of devices that can act as quantum memories. The realisation of such devices by doping solid state cavities with paramagnetic ions imposes a trade-off between ion concentration and cavity coherence time. Here, we investigate an alternative approach involving interactions between photons and naturally occurring impurity ions in ultra-pure crystalline microwave cavities exhibiting exceptionally high quality factors. We implement a hybrid Whispering Gallery/Electron Spin Resonance method to perform rigorous spectroscopy of an undoped single-crystal sapphire resonator over the frequency range 8{19 GHz, and at external applied DC magnetic fields up to 0.9 T. Measurements of a high purity sapphire cooled close to 100 mK reveal the presence of Fe3+, Cr3+, and V2+ impurities. A host of electron transitions are measured and identified, including the two-photon classically forbidden quadrupole transition (Δms = 2) for Fe3+, as well as hyperfine transitions of V2+.

Paper Details

Date Published: 7 December 2013
PDF: 8 pages
Proc. SPIE 8923, Micro/Nano Materials, Devices, and Systems, 89230R (7 December 2013); doi: 10.1117/12.2033898
Show Author Affiliations
Warrick G. Farr, The Univ. of Western Australia (Australia)
Daniel L. Creedon, The Univ. of Western Australia (Australia)
Maxim Goryachev, The Univ. of Western Australia (Australia)
Karim Benmessai, The Univ. of Western Australia (Australia)
Ctr. de Développement des Téchnologies Avancées (Algeria)
Michael E. Tobar, The Univ. of Western Australia (Australia)

Published in SPIE Proceedings Vol. 8923:
Micro/Nano Materials, Devices, and Systems
James Friend; H. Hoe Tan, Editor(s)

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