Multiple Fermi pockets revealed by Shubnikov-de Haas oscillations in WTe2

TL;DR

This study uses magneto-transport measurements to reveal a complex Fermi surface in WTe2, identifying multiple electron and hole pockets that explain its unusual nonsaturating magnetoresistance.

Contribution

The paper provides the first detailed experimental evidence of multiple Fermi pockets in WTe2 using Shubnikov-de Haas oscillations, clarifying its electronic structure.

Findings

Identification of three Fermi pockets via oscillation frequencies

Nearly perfect electron-hole compensation in WTe2

Explanation of nonsaturating magnetoresistance

Abstract

We use magneto-transport measurements to investigate the electronic structure of WTe2 single crystals. A non-saturating and parabolic magnetoresistance is observed in the temperature range between 2.5 to 200 K and magnetic fields up to 8 T. Shubnikov - de Haas oscillations with beating patterns are observed. The fast Fourier transform of the SdH oscillations reveals three oscillation frequencies, corresponding to three pairs of Fermi pockets with comparable effective masses , m* ~ 0.31 me. By fitting the Hall resistivity, we infer the presence of one pair of electron pockets and two pairs of hole pockets, together with nearly perfect compensation of the electron-hole carrier concentration. These magnetotransport measurements reveal the complex electronic structure in WTe2, explaining the nonsaturating magnetoresistance.