Collision-induced interaction dynamics of hyperpolarized nuclear spins in functionalized microfabricated vapor cells for chip-scale quantum devices

We theoretically modeled and experimentally demonstrated the collision-induced interaction of ¹³¹Xe nuclear spins, including the Fermi contact interaction and wall-dependent quadrupole relaxation. We utilized heater-integrated, wafer-level microfabricated ⁸⁷Rb - ¹³¹Xe atomic vapor cells with a single-chamber cylindrical structure and a single-beam absorption-based atomic magnetometer to probe hyperpolarized ¹³¹Xe nuclei precession in situ. We investigated the interaction of ¹³¹Xe nuclear spins with ⁸⁷Rb alkali-metal vapor atoms and atomic vapor cell walls consistent with the theoretical model. Furthermore, we measured a Fermi contact factor of approximately 510 ± 40, which reveals an enhancement in the spin-exchange collisions for ⁸⁷Rb - ¹³¹Xe, and an activation energy of 0.18 ± 0.02 eV, which characterizes the desorption and diffusion process of ¹³¹Xe induced by the wall collision process. These results can inspire the development of chip-scale atomic spin devices with enhanced stability and sensitivity.