Author(s): T.-H. Chien, S.-C. Wu, Y.-H. Su, L.-R. Liu, N.-C. Chiu, M. Sarkar, Q. Zhou, and Y.-J. Lin We report the first experimental realization of a synthetic Hall torus using a spinor Bose-Einstein condensate confined in a ring-shaped trap with in situ imaging. By cyclically coupling three hyperfine spin states via Raman and microwave fields, we impose a periodic boundary condition in the synthe… [Phys. Rev. Lett. 137, 173401] Published Mon Oct 19, 2026