Journal
PHYSICAL REVIEW B
Volume 92, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.205134
Keywords
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Funding
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering
- LANL LDRD program
- State of Florida through NSF Cooperative Grant [DMR-1157490]
- National Science Foundation, the Department of Energy
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Via angular Shubnikov-de Haas (SdH) quantum oscillations measurements, we determine the Fermi surface topology of NbAs, a Weyl semimetal candidate. The SdH oscillations consist of two frequencies corresponding to two Fermi surface extrema: 20.8 T (alpha pocket) and 15.6 T (beta pocket). The analysis, including a Landau fan plot, shows that the beta pocket has a Berry phase of pi and a small effective mass of similar to 0.033 m(0), indicative of a nontrivial topology in momentum space, whereas the a pocket has a trivial Berry phase of 0 and a heavier effective mass of similar to 0.066 m(0). From the effective mass and the beta-pocket frequency, we determine that the Weyl node is 110.5 meV from the chemical potential. An electron-hole compensation effect is discussed in this system, and its impact on magnetotransport properties is addressed. The difference between NbAs and other monopnictide Weyl semimetals is also discussed.
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