Topological materials exhibit exotic electronic properties governed by the mathematics of topology rather than chemistry. Weyl semimetals, in particular, host massless fermions that could enable dissipationless electronics.

Experimental Verification

Using angle-resolved photoemission spectroscopy (ARPES) at BL-31, researchers from Oxford and Max Planck directly observed Weyl cone crossings at the predicted k-space locations in TaSb₂. The measurements were performed at 12K with 0.2° angular resolution.

The observed Fermi arc surface states span the entire Brillouin zone boundary, confirming TaSb₂ as a Type-II Weyl semimetal with the largest known arc length. This makes it an ideal platform for studying chiral anomaly transport.