Magneto-transport and Shubnikov-de Haas oscillations in the layered ternary telluride Ta3SiTe6 topological semimetal

TL;DR

This study investigates the magnetoresistance and quantum oscillations in the topological semimetal Ta3SiTe6, revealing details about its Fermi surface and confirming it as a hole-dominated system through experimental and theoretical analysis.

Contribution

It provides the first detailed analysis of quantum oscillations in Ta3SiTe6, linking experimental data with first-principles calculations to elucidate its Fermi surface characteristics.

Findings

Single oscillatory frequency observed in SdH oscillations

Fermi pocket cross-section area of 0.13 Å⁻² identified

Ta3SiTe6 confirmed as a hole-dominated topological semimetal

Abstract

Topological semimetals characterize a novel class of quantum materials hosting Dirac/Weyl fermions. The important features of topological fermions can be exhibited by quantum oscillations. Here we report the magnetoresistance and Shubnikov-de Haas (SdH) quantum oscillation of longitudinal resistance in the single crystal of topological semimetal Ta3SiTe6 with the magnetic field up to 38 T. Periodic amplitude of the oscillations reveals related information about the Fermi surface. The fast Fourier transformation spectra represent a single oscillatory frequency. The analysis of the oscillations shows the Fermi pocket with a cross-section area of 0.13 angstrom power minus 2. Combining magneto-transport measurements and the first-principles calculation, we find that these oscillations come from the hole pocket. Hall resistivity and the SdH oscillations recommend that Ta3SiTe6 is a hole dominated system.