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We report systematic magneto-transport measurements and ab initiocalculations on single-crystalline TaP2, a new member of the transition-metaldipnictides. We observed unsaturated magnetoresistance (MR) reaching ~ 700% ata magnetic field (B) of 9 T at 2 K along with striking Shubnikov-de Hass (SdH)oscillations. Our analysis on the SdH oscillations reveals nonzero Berry phase,indicating nontrivial band topology. The analysis also uncovers threefundamental magnetic oscillation frequencies of 72 T, 237 T, and 356 T,consistent with the theoretical calculations which reveal one hole pocket andtwo electron pockets at the L point and one electron pocket at the Z point ofthe Brillouin zone. We also found negative longitudinal MR (n-MR) within anarrow window of the angles between B and the electric current (I). The n-MRcould be fitted with the Adler-Bell-Jackiw chiral anomaly equation but theorigin remains yet ambiguous. The ab inito calculations suggest TaP2 as a weaktopological insulator with the Z2 indices of (0; 111), which exhibitstopological surface states on the (001) surface.

Quantum oscillations and nontrivial topological state in a compensated semimetal TaP2