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We report a topological semimetal W2As3 with a space group C2/m. Based on thefirst-principles calculations, band crossings are partially gapped whenspin-orbit coupling is included. The Z2 indices at the electron filling are[1;111], characterizing a strong topological insulator and topological surfacestates. From the magnetotransport measurements, nearly quadratic fielddependence of magnetoresistance (MR) (B || [200]) at 3 K indicates anelectron-hole compensated compound whose longitudinal MR reaches 115 at 3 K and15 T. In addition, multiband features are detected from the high-magnetic-fieldShubnikov-de Haas (SdH) oscillation, Hall resistivity, and band calculations. Anontrivial pi Berry's phase is obtained, suggesting the topological feature ofthis material. A two- band model can fit well the conductivity and Hallcoefficient. Our experiments manifest that the transport properties of W2As3are in good agreement with the theoretical calculations.

Quantum transport in a compensated semimetal W2As3 with nontrivial Z2 indices