Growth and transport measurements of nanowires of cubic B20 topological semimetals

Since the discovery of topological insulators and semimetals, topological materials are key research frontiers in the field of condensed matter physics. One of the examples of the topological material is a Weyl semimetal where two non-degenerate bands cross at a node in a momentum space and acquires a quantized topological charge known as the Chern number. Among them, cubic B20 material systems (such as CoSi, RhSi, AlPt) are found to possess unconventional chiral fermions with higher Chern number and long fermi arcs due to multiple point degeneracies at high symmetry Brillouin points. We have synthesized single-crystal cubic B20 topological semimetal nanowires (NWs) of CoSi and CrGe via chemical vapor deposition (CVD). We conducted magnetotransport measurements with different configuration of applied magnetic field (in-plane/out-of-plane) and current direction to connect quantum topological properties to electronic band structures. We are also performing physical property measurements under high magnetic field. These NW systems can act as the perfect prototypes to understand the impact of surface states and bulk Landau levels on the transport behaviors in finite size topological semimetals.