Third order nonlinear transport properties in topological chiral antiferromagnetic semimetal CoNb3S6
The topology between Bloch states in reciprocal space has attracted tremendous attention in recent years. The quantum geometry of the band structure is composed of quantum metric as real part and berry curvature as imaginary part. While the Berry curvature, the Berry curvature dipole and Berry conne...
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Zusammenfassung: | The topology between Bloch states in reciprocal space has attracted
tremendous attention in recent years. The quantum geometry of the band
structure is composed of quantum metric as real part and berry curvature as
imaginary part. While the Berry curvature, the Berry curvature dipole and Berry
connection polarizability have been recently revealed by the first order
anomalous hall, second order and third order nonlinear Hall effect
respectively, the quantum metric induced second order nonlinear transverse and
longitudinal response in topological antiferromagnetic material MnBi2Te4 was
only very recently reported. Here we demonstrate the similar third order
nonlinear transport properties in the topological antiferromagnetic CoNb3S6. We
observed that the third order nonlinear longitudinal V3{\omega} xx increase
significantly at the antiferromagnetic transition temperature TN ~ 29 K, which
was probably induced by the quantum metric without time-reversal symmetry or
inversion symmetry. Besides, temperature-dependent nonlinear behaviour was
observed in the first order I-V curve below the Neel temperature TN, which was
not reported in MnBi2Te4 and FeSn. Such nonlinear I-V behaviour hints for the
possible existence of Charge Density Wave (CDW) state, which has been
discovered in its sister material FeNb3S6. Simultaneously, two plateaus in the
third order nonlinear longitudinal V3{\omega} xx~ I^{\omega} curve are
observed, which is also speculated to be related with the possible CDW state.
However, the genuine mechanism for the first order nonlinear I-V and its
relation with the third order nonlinear transport call for more experimental
investigations and theoretical interpretation. Our work provides a way to
explore third harmonic nonlinear transport and interaction with magnetic order
and CDW. |
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DOI: | 10.48550/arxiv.2312.05824 |