Exotic Magnetotransport in Correlated Topological Oxide Heterostructures

Oxide heterostructures have been a central topic of research over the past few decades due to their correlated phenomena with intriguing electronic and magnetic properties, including high-temperature superconductivity, colossal magnetoresistance, multiferroicity, etc. The recent introduction of band topology into these correlated systems has enabled new insights into creating novel quantum phenomena and materials, such as Weyl and Dirac semimetals, axion insulators, and topological Mott insulators. However, the progress in experimental realization is largely hindered by the difficulties in synthesizing high quality materials and the lack of suitable experimental probes. In this talk, we will present magnetotransport as a versatile and sensitive means to probe and understand topological states in oxide heterostructures. Furthermore, we will discuss about how epitaxial strain can reveal hidden topological states, particularly in 4d niobates and 5d iridates. The unique quantum transport properties, including the anomalous Hall effect and planar Hall effect, that emerge from their correlated and topological nature will be discussed.