Hyperfine spectroscopy in a quantum-limited spectrometer

• URL: http://arxiv.org/abs/2001.04854v3
• Date: Sun, 14 Feb 2021 23:02:55 GMT
• Title: Hyperfine spectroscopy in a quantum-limited spectrometer
• Authors: S. Probst, G.L. Zhang, M. Ran\v{c}i\'c, V. Ranjan, M. Le Dantec, Z. Zhong, B. Albanese, A. Doll, R.B. Liu, J.J.L. Morton, T. Chaneli\`ere, P. Goldner, D. Vion, D. Esteve, P. Bertet
• Abstract summary: We report measurements of electron spin echo envelope modulation (ESEEM) performed at millikelvin temperatures. The high quality factor and small mode volume (down to 0.2pL) of the resonator allow to probe a small number of spins. We measure 2-pulse ESEEM on two systems: erbium ions coupled to $183$W nuclei in a natural-abundance $textCaWO_4$ crystal, and bismuth donors coupled to residual $29$Si nuclei in a silicon substrate.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report measurements of electron spin echo envelope modulation (ESEEM) performed at millikelvin temperatures in a custom-built high-sensitivity spectrometer based on superconducting micro-resonators. The high quality factor and small mode volume (down to 0.2pL) of the resonator allow to probe a small number of spins, down to $5\cdot 10^2$. We measure 2-pulse ESEEM on two systems: erbium ions coupled to $^{183}$W nuclei in a natural-abundance $\text{CaWO}_4$ crystal, and bismuth donors coupled to residual $^{29}$Si nuclei in a silicon substrate that was isotopically enriched in the $^{28}$Si isotope. We also measure 3- and 5-pulse ESEEM for the bismuth donors in silicon. Quantitative agreement is obtained for both the hyperfine coupling strength of proximal nuclei, and the nuclear spin concentration.

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