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Observation of quantum topological Hall effect in the Weyl semimetal candidate HgSe.

08:00 EDT 19th June 2019 | BioPortfolio

Summary of "Observation of quantum topological Hall effect in the Weyl semimetal candidate HgSe."

The magnetoresistance and Hall effect of a single HgSe crystal with an extremely low electron concentration of 8.8×10<sup>15</sup> cm<sup>-3</sup> were studied in a quantising magnetic field applied both along and across the direction of the electric current. As the result, a broad plateau was discovered in the ordinary (transverse) Hall resistance in the quantum limit. Within a framework of quantum spin Hall effect for an inversion breaking Weyl semimetal, we associate this plateau with a contribution to Hall conductivity from Chern insulator edge states when only a zero Landau level is occupied. In addition to the plateau in the quantum limit, we also detected a well-developed plateau-like behaviour in a phenomenologically-introduced "longitudinal" Hall resistivity. In the "longitudinal" Hall conductivity, a step-like behaviour was revealed, which we identify with the discovery of half-integer quantum spin Hall effect in HgSe. This effect, being purely topological in origin, supplements the non-trivial Weyl semimetal physics and may serve as a promising magnetotransport method for the detection of Weyl nodes in a studied material.

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This article was published in the following journal.

Name: Journal of physics. Condensed matter : an Institute of Physics journal
ISSN: 1361-648X
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