Giant Topological Hall Effect and Tunable Chiral Symmetry in a Localized Asymmetric Oxide Heterostructure

Topological Hall effect (THE) provides the electrical detection of topologically protected chiral spin structures such as skyrmions and has attracted intensive attentions due to the potential application in future information technology. Here we found the asymmetric ruthenate/titanate heterostructure exhibiting a giant THE resistivity in striking contrast to zero anomalous Hall effect (AHE) because of localization and the quantum interference induced real space Berry phase. We further present a new technique – magnetic-field angle dependent resistance (MAR) measurement – capable to reveal emergent chiral symmetries from different chiral spin textures. Our findings reveal the localization regime to be a new playground for exploring exotic chiral spin phenomena, and demonstrate the MAR as a new technique providing evidence of real space spin chirality.