Observation of anomalous Hall effect in a non-magnetic two-dimensional electron 
system

Maryenko, D.; Mishchenko, A. S.; Bahramy, M. S.; Ernst, A.; Falson, J.; Kozuka, Y.; Tsukazaki, A.; Nagaosa, N.; Kawasaki, M.

doi:10.1038/ncomms14777

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Observation of anomalous Hall effect in a non-magnetic two-dimensional electron system

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Ernst, A.
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Citation

Maryenko, D., Mishchenko, A. S., Bahramy, M. S., Ernst, A., Falson, J., Kozuka, Y., et al. (2017). Observation of anomalous Hall effect in a non-magnetic two-dimensional electron system. Nature Communications, 8(14): 14777. doi:10.1038/ncomms14777.

Cite as: https://hdl.handle.net/21.11116/0000-000A-E3F5-1

Abstract

Anomalous Hall effect, a manifestation of Hall effect occurring in systems without time-reversal symmetry, has been mostly observed in ferromagnetically ordered materials. However, its realization in high-mobility two-dimensional electron system remains elusive, as the incorporation of magnetic moments deteriorates the device performance compared to non-doped structure. Here we observe systematic emergence of anomalous Hall effect in various MgZnO/ZnO heterostructures that exhibit quantum Hall effect. At low temperatures, our nominally non-magnetic heterostructures display an anomalous Hall effect response similar to that of a clean ferromagnetic metal, while keeping a large anomalous Hall effect angle θ_AHE≈20°. Such a behaviour is consistent with Giovannini–Kondo model in which the anomalous Hall effect arises from the skew scattering of electrons by localized paramagnetic centres. Our study unveils a new aspect of many-body interactions in two-dimensional electron systems and shows how the anomalous Hall effect can emerge in a non-magnetic system.