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Topological charge and heat transport in Weyl semimetals

日程 : 2019年6月18日(火) 16:00 - 17:00 場所 : 物性研究所本館6階 第5セミナー室 (A615) 講師 : Dr. Binghai Yan 所属 : Weizmann Institute of Science, Israel 世話人 : 中辻知 (63240),小森文夫(63310)

Topological Weyl semimetals provide fascinating platforms to examine exotic transport phenomena such as the chiral anomaly and the anomalous Hall effect. In the ordinary (longitudinal) transport, the Wiedemann-Franz law links the ratio of electronic charge and heat conductivity to a fundamental constant. It has been tested in numerous solids, but the extent of its relevance to the anomalous (transverse) transport remains an open question. I will introduce recently-discovered magnetic Weyl materials Mn3Sn and Mn3Ge. Their noncollinear chiral spin structure induces huge anomalous Hall effect and thermal Hall effect in a Kagome-type lattice. In collaboration with experiment, we reveal a finite temperature violation of the Wiedemann-Franz correlation. This violation is caused by the Berry curvature distribution, rather than the inelastic scattering as observed in ordinary metals.

(公開日: 2019年06月11日)