Atomic Scale Crystal Field Mapping of Polar Vortices in Oxide Superlattices. (August 2022) - Susarla, Sandhya; García-Fernández, Pablo; Ophus, Colin; Das, Sujit; Aguado-Puente, Pablo; McCarter, Margaret; Ercius, Peter; Martin, Lane W.; Ramesh, Ramamoorthy; Junquera, Javier