Hyperfine spectroscopy in a quantum-limited spectrometer
Résumé
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 5×10$^2$. We measure two-pulse ESEEM on two systems: erbium ions coupled to $^{183}$W nuclei in a natural-abundance CaWO4 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 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.
Domaines
Physique [physics]| Origine | Publication financée par une institution |
|---|---|
| licence |
