三重简并结拓扑半金属碳化钨的磁输运性质
Magnetotransport properties of the triply degenerate node topological semimetal tungsten carbide
摘要：
本文报道了碳化钨单晶的磁电阻（MR）、霍尔效应和de Haas-van Alphen（dHvA）效应的研究。当磁场在垂直于电流方向的平面内旋转时，WC在低温下表现出场致金属-绝缘体相变和大的非饱和二次磁电阻。由于磁场与电流平行，只有当电流沿一定方向流动时，才能观察到明显的负纵向MR。霍尔效应表明WC是一种理想的补偿半金属，这可能与大的非饱和二次MR有关。dHvA振荡分析表明WC是一个多带系统，具有小的费米面截面积和轻的回旋有效质量。我们的结果表明，WC是一个理想的平台，研究最近提出的新的费米子与三重简并交叉点。
英文摘要：
We report the magnetoresistance (MR), Hall effect, and de Haas-van Alphen (dHvA) effect studies of the single crystals of tungsten carbide, WC, which is predicted to be a new type of topological semimetal with triply degenerate nodes. With the magnetic field rotated in the plane perpendicular to the current, WC shows field induced metal to insulator like transition and large nonsaturating quadratic MR at low temperature. As the magnetic field parallel to the current, a pronounced negative longitudinal MR only can be observed when the current flows along the certain direction. Hall effect indicates WC is a perfect compensated semimetal, which may be related to the large nonsaturating quadratic MR. The analysis of dHvA oscillations reveals that WC is a multiband system with small cross-sectional areas of Fermi surface and light cyclotron effective masses. Our results indicate that WC is an ideal platform to study the recently proposed New Fermions with triply degenerate crossing points.
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