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arXiv · 1706.10135

Fermi surface of the Weyl type-II metallic candidate WP2

R. Schönemann·N. Aryal·Q. Zhou·Y. -C. Chiu·K. -W. Chen·T. J. Martin·G. T. McCandless·J. Y. Chan·E. Manousakis·L. Balicas
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Abstract

Weyl type-II fermions are massless quasiparticles that obey the Weyl equation and which are predicted to occur at the boundary between electron- and hole-pockets in certain semi-metals, i.e. the (W,Mo)(Te,P)$_2$ compounds. Here, we present a study of the Fermi-surface of WP$_2$ \emph{via} the Shubnikov-de Haas (SdH) effect. Compared to other semi-metals WP$_2$ exhibits a very low residual resistivity, i.e. $ρ_0 \simeq 10$ n$Ω$cm, which leads to perhaps the largest non-saturating magneto-resistivity $(ρ(H))$ reported for any compound. For the samples displaying the smallest $ρ_0$, $ρ(H)$ is observed to increase by a factor of $2.5 \times 10^{7}$ $\%$ under $μ_{0}H = 35$ T at $T = 0.35$ K. The angular dependence of the SdH frequencies is found to be in very good agreement with the first-principle calculations when the electron- and hole-bands are slightly shifted with respect to the Fermi level, thus supporting the existence of underlying Weyl type-II points in WP$_2$.

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R. Schönemann, N. Aryal, Q. Zhou, Y. -C. Chiu, K. -W. Chen, T. J. Martin, G. T. McCandless, J. Y. Chan, E. Manousakis, L. Balicas. 2017-07-03. Fermi surface of the Weyl type-II metallic candidate WP2. https://doi.org/10.1103/physrevb.96.121108

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