A spinless crystal for a high-performance solid-state $^{229}$Th nuclear clock

Solid-state $^{229}$Th nuclear clocks require a host material whose band gap is larger than the 8.4 eV nuclear transition energy. As such, excitation of the $^{229}$Th nuclear state has so far only been demonstrated in metal fluorides, specifically CaF$_2$, LiSrAlF$_6$, and ThF$_4$, where the large electronegativity of the halogen leads to sufficient band gaps. However, it is expected that the nuclear magnetic moment of the fluorine gives rise to a leading order broadening mechanism that limits the clock stability. Here, we use concepts of molecular design to identify a polyatomic anion, SO$_4^{2-}$, that is both nuclear spin free and of sufficient electron affinity to result in a high band gap metal sulfate system. Using state-of-the-art calculations, we find that the band gap of Th(SO$_4$)$_2$ is approximately 9 eV, large enough for direct laser excitation of $^{229}$Th. Low concentrations of $^{229}$Th in the otherwise spinless $^{232}$Th(SO$_4$)$_2$ crystal mitigate $^{229}$Th-$^{229}$Th interactions. Furthermore, the introduction of $^{229}$Th does not modify the material band gap nor introduce electronic states associated with nuclear quenching. By removing one of the primary sources of nuclear line broadening in the crystal, the nuclear magnetic dipole-dipole interaction, a nuclear clock with instability as low as $\sigma = 4.6\times10^{-23}/\sqrt{\tau}$, where ${\tau}$ is the averaging time, may be realized. This is roughly six orders of magnitude lower than previously thought possible.