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

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 m 0, 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 m 0. 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.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-15-24779
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 20; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1467321
Alternate Identifier(s):
OSTI ID: 1227521

Luo, Yongkang, Ghimire, Nirmal Jeevi, Wartenbe, Mark, Neupane, Madhab, Mcdonald, Ross David, Bauer, Eric Dietzgen, Thompson, Joe David, and Ronning, Filip. Electron-hole compensation effect between topologically trivial electrons and nontrivial holes in NbAs. United States: N. p., Web. doi:10.1103/PhysRevB.92.205134.
Luo, Yongkang, Ghimire, Nirmal Jeevi, Wartenbe, Mark, Neupane, Madhab, Mcdonald, Ross David, Bauer, Eric Dietzgen, Thompson, Joe David, & Ronning, Filip. Electron-hole compensation effect between topologically trivial electrons and nontrivial holes in NbAs. United States. doi:10.1103/PhysRevB.92.205134.
Luo, Yongkang, Ghimire, Nirmal Jeevi, Wartenbe, Mark, Neupane, Madhab, Mcdonald, Ross David, Bauer, Eric Dietzgen, Thompson, Joe David, and Ronning, Filip. 2015. "Electron-hole compensation effect between topologically trivial electrons and nontrivial holes in NbAs". United States. doi:10.1103/PhysRevB.92.205134. https://www.osti.gov/servlets/purl/1467321.
@article{osti_1467321,
title = {Electron-hole compensation effect between topologically trivial electrons and nontrivial holes in NbAs},
author = {Luo, Yongkang and Ghimire, Nirmal Jeevi and Wartenbe, Mark and Neupane, Madhab and Mcdonald, Ross David and Bauer, Eric Dietzgen and Thompson, Joe David and Ronning, Filip},
abstractNote = {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.},
doi = {10.1103/PhysRevB.92.205134},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 20,
volume = 92,
place = {United States},
year = {2015},
month = {11}
}