Shubnikov–de Haas oscillations and planar Hall effect in HfTe2

Layered transition-metal dichalcogenide $\mathrm{Hf}{\mathrm{Te}}_{2}$ is a topological semimetal candidate attracting increasing attention recently. The map of the Fermi surface is of interest and importance to understand its properties. Here, we present a study of Shubnikov--de Haas (SdH) oscillations and planar Hall effect (PHE) in $\mathrm{Hf}{\mathrm{Te}}_{2}$. The single crystals grown by flux method show the largest unsaturated magnetoresistance (MR) effect of $1.1\ifmmode\times\else\texttimes\fi{}{10}^{4}%$ at 14 T and 2 K. The angle-resolved SdH oscillations reveal that the Fermi surface consists of three pockets with different anisotropy. In addition, we observe PHE and anisotropic MR effect in the material for a wide temperature range. The effective mass, carrier density, and quantum transport mobility are quantified in the system, and the Berry phase is discussed. Our work provides crucial insights into the electronic structure and the Fermi surface of the semimetal.