Evidence for topological type-II Weyl semimetal WTe(2)

Recently, a type-II Weyl fermion was theoretically predicted to appear at the contact of electron and hole Fermi surface pockets. A distinguishing feature of the surfaces of type-II Weyl semimetals is the existence of topological surface states, so-called Fermi arcs. Although WTe(2) was the first material suggested as a type-II Weyl semimetal, the direct observation of its tilting Weyl cone and Fermi arc has not yet been successful. Here, we show strong evidence that WTe(2) is a type-II Weyl semimetal by observing two unique transport properties simultaneously in one WTe(2) nanoribbon. The negative magnetoresistance induced by a chiral anomaly is quite anisotropic in WTe(2) nanoribbons, which is present in b-axis ribbon, but is absent in a-axis ribbon. An extra-quantum oscillation, arising from a Weyl orbit formed by the Fermi arc and bulk Landau levels, displays a two dimensional feature and decays as the thickness increases in WTe(2) nanoribbon.