Hyperfine spectroscopy in a quantum-limited spectrometer

Sebastian Probst (1, 2) , Gengli Zhang (3, 4) , Miloš Rančić (1, 2) , Vishal Ranjan (1, 2) , Marianne Le Dantec (1, 2) , Zhonghan Zhang (5) , Bartolo Albanese (1, 2) , Andrin Doll (1, 2) , Ren Bao Liu (3, 4) , John Morton (6) , Thierry Chanelière (7) , Philippe Goldner (5) , Denis Vion (1, 2) , Daniel Esteve (1, 2) , Patrice Bertet (1, 2)

1 SPEC - UMR3680 - Service de physique de l'état condensé
2 QUANTRONICS - Quantronics Group
3 The Chinese University of Hong Kong [Hong Kong]
4 Department of Physics [Hong Kong University of Science and Technology]
5 IRCP - Institut de Recherche de Chimie Paris
6 London Centre for Nanotechnology
7 NEEL - NPSC - Nanophysique et Semiconducteurs

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 0.2 pL) of the resonator allow us to probe a small number of spins, down to 5×102. We measure two-pulse ESEEM on two systems: erbium ions coupled to 183W nuclei in a natural-abundance CaWO4 crystal and bismuth donors coupled to residual 29Si nuclei in a silicon substrate that was isotopically enriched in the 28Si isotope. We also measure three- and five-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.

Domains: Physics [physics]

Sebastian Probst, Gengli Zhang, Miloš Rančić, Vishal Ranjan, Marianne Le Dantec, et al.. Hyperfine spectroscopy in a quantum-limited spectrometer. Magnetic Resonance, 2020, 1 (2), pp.315-330. ⟨10.5194/mr-1-315-2020⟩. ⟨cea-03116462⟩