We experimentally investigate the magnetic field dependence of Andreev transport through a region of proximity-induced superconductivity in CoSi topological chiral semimetal. With increasing parallel to the CoSi surface magnetic field, the sharp subgap peaks, associated with Andreev bound states, move together to nearly-zero bias position, while there is only monotonic peaks suppression for normal to the surface fields. The zero-bias dV/dI resistance value is perfectly stable with changing the in-plane magnetic field. As the effects are qualitatively similar for In and Nb superconducting leads, they reflect the properties of a proximized CoSi surface. The Andreev states coalescence and stability of the zero-bias dV/dI value with increasing in-plane magnetic field are interpreted as the joined effect of the strong spin-orbit coupling and the Zeeman interaction, known for proximized semiconductor nanowires. We associate the observed magnetic field anisotropy with the recently predicted in-plane polarized spin texture of the Fermi arcs surface states.

我们通过实验研究了安德烈耶夫通过CoSi拓扑手性半金属中的邻近感应超导性区域的磁场依赖性。随着平行于CoSi表面磁场的增加，与Andreev束缚态相关的尖锐的亚隙峰一起移动到接近零的偏置位置，而对于垂直于表面场的只有单调峰抑制。零偏置dV / dI电阻值在改变面内磁场时非常稳定。由于In和Nb超导引线的影响在质量上相似，因此它们反映了接近CoSi表面的特性。安德烈耶夫（Andreev）提出零偏置dV / dI的合并和稳定性随着平面内磁场的增加，其值被解释为强自旋轨道耦合和塞曼相互作用的结合效应，这对于近距离半导体纳米线而言是众所周知的。我们将观察到的磁场各向异性与费米弧表面态的最近预测的面内极化自旋织构相关联。