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arXiv · 2208.02479

Electric field control of anomalous Hall effect in CaIrO$_3$/CaMnO$_3$ heterostructure

R. Nishino·T. C. Fujita·M. Kawasaki
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Abstract

We demonstrate an electric field control of anomalous Hall effect emerging in CaIrO$_3$/CaMnO$_3$ heterostructures. We fabricate both electron-type and hole-type carrier samples by tuning epitaxial strain and then control the carrier density in CaIrO$_3$ layer via electric double layer gating technique. As the Fermi energy of CaIrO$_3$ is tuned close to the Dirac line node, anomalous Hall conductivity is enlarged in both carrier-type samples. This result reveals that the anomalous Hall effect comes from the intrinsic origin reflecting the Dirac like dispersion in CaIrO$_3$. We propose that band splitting induced by the interface ferromagnetism yields several band crossing points near the Dirac line node. These points play as a source of the Berry curvature and contribute to the anomalous Hall effect.

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R. Nishino, T. C. Fujita, M. Kawasaki. 2022-08-04. Electric field control of anomalous Hall effect in CaIrO$_3$/CaMnO$_3$ heterostructure. https://doi.org/10.1063/5.0097881

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