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  • Title: Observation of anomalous Hall effect in a non-magnetic two-dimensional electron system.
    Author: Maryenko D, Mishchenko AS, Bahramy MS, Ernst A, Falson J, Kozuka Y, Tsukazaki A, Nagaosa N, Kawasaki M.
    Journal: Nat Commun; 2017 Mar 16; 8():14777. PubMed ID: 28300133.
    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.
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