Coalescence of Andreev Bound States on the Surface of a Chiral Topological Semimetal

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