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

D. Maryenko (), A. S. Mishchenko, M. S. Bahramy, A. Ernst, J. Falson, Y. Kozuka, A. Tsukazaki, N. Nagaosa and M. Kawasaki
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D. Maryenko: RIKEN Center for Emergent Matter Science (CEMS)
A. S. Mishchenko: RIKEN Center for Emergent Matter Science (CEMS)
M. S. Bahramy: RIKEN Center for Emergent Matter Science (CEMS)
A. Ernst: Max-Planck-Institut fr Mikrostrukturphysik
J. Falson: University of Tokyo
Y. Kozuka: University of Tokyo
A. Tsukazaki: Institute for Materials Research, Tohoku University
N. Nagaosa: RIKEN Center for Emergent Matter Science (CEMS)
M. Kawasaki: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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 θAHE≈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.

Date: 2017
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DOI: 10.1038/ncomms14777

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