Thermodynamic Signatures of Weyl Fermions in NbP

Thermodynamic Signatures of Weyl Fermions in NbP

Weyl semimetals have attracted considerable attention recently due to their conjectured linear band crossings in momentum space. Broken time-reversal or inversion symmetry lifts the spin-degeneracy at a Dirac node to reveal two Weyl points that are characterized by a right- and left-handedness (chirality). Weyl semimetals are expected to host exotic phenomena, including topological Fermi-arc surface states and unusual magnetotransport properties. The search for such materials, however, is often complicated by the additional presence of trivial (non-Weyl) sections of Fermi surface. Experimental signatures of Weyl fermions are further hindered by a chemical potential that often resides far from the Weyl points.