Abstract
Weyl semimetals are often considered the 3D-analogon of graphene or topological insulators. The evaluation of quantum oscillations in these systems remains challenging because there are often multiple conduction bands. We observe de Haas-van Alphen oscillations with several frequencies in a single crystal of the Weyl semimetal niobium phosphide. For each fundamental crystal axis, we can fit the raw data to a superposition of sinusoidal functions, which enables us to calculate the characteristic parameters of all individual bulk conduction bands using Fourier transform with an analysis of the temperature and magnetic field-dependent oscillation amplitude decay. Our experimental results indicate that the band structure consists of Dirac bands with low cyclotron mass, a non-trivial Berry phase and parabolic bands with a higher effective mass and trivial Berry phase.
Highlights
Topological insulators, Dirac semimetals and most recently Weyl semimetals (WSM) are the subject of considerable research interest in both fundamental physics[1,2,3] and with respect to applications[4,5,6]
We present de Haas-van Alphen measurements of a NbP single crystal with an intrinsic Fermi level as close as 3.7 meV to the Weyl nodes
We analyse the bulk magnetometry of the Fermi surface of the Weyl semimetal NbP for the fundamental crystal orientations
Summary
Topological insulators, Dirac semimetals and most recently Weyl semimetals (WSM) are the subject of considerable research interest in both fundamental physics[1,2,3] and with respect to applications[4,5,6]. Electric measurements on NbP single crystals have shown strong Shubnikov-de Haas (SdH) oscillations and evidence for Dirac-like dispersions[5,7], but the individual conduction band’s Berry phases have not been clearly analysed. Ab-initio band structure calculations have predicted that the conduction bands in NbP will generally be trivial[17] because the theoretical position of the Fermi level encompasses the Weyl nodes.
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