Peng-Rui Jiao

$\text{Dy}^{3+}$ in $\text{CaWO}_4$ exhibits an electric-field coupling three times larger than $\text{Er}^{3+}$—the highest ever measured for a rare-earth ion in this host—revealing how dense $J$-multiplet structures can dramatically amplify Stark susceptibility in solid-state spin systems.

Tailoring hyperfine level structures directly through synthetic chemistry unlocks 200 MHz quantum optical storage that is physically impossible in conventional solid-state rare-earth hosts.