Details

Autor(en) / Beteiligte

• Luo, Yongkang
• Ghimire, N. J.
• Wartenbe, M.
• Choi, Hongchul
• Neupane, M.
• McDonald, R. D.
• Bauer, E. D.
• Zhu, Jianxin
• Thompson, J. D.
• Ronning, F.

Titel

Electron-hole compensation effect between topologically trivial electrons and nontrivial holes in NbAs

Ist Teil von

• Physical review. B, Condensed matter and materials physics, 2015-11, Vol.92 (20), Article 205134

Ort / Verlag

United States: American Physical Society (APS)

Erscheinungsjahr

2015

Quelle

PROLA - Physical Review

Beschreibungen/Notizen

• In this study, 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 (α pocket) and 15.6 T (β pocket). The analysis, including a Landau fan plot, shows that the β pocket has a Berry phase of π and a small effective mass of ~ 0.033 m0, indicative of a nontrivial topology in momentum space, whereas the α pocket has a trivial Berry phase of 0 and a heavier effective mass of ~ 0.066 m0. From the effective mass and the β -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. Finally, the difference between NbAs and other monopnictide Weyl semimetals is also discussed.