Origin of planar Hall effect in type-II Weyl semimetal MoTe2

Besides the negative longitudinal magnetoresistance (MR), planar Hall effect (PHE) is a newly emerging experimental tool to test the chiral anomaly or nontrivial Berry curvature in Weyl semimetals (WSMs). However, the origins of PHE in various systems are not fully distinguished and understood. Here...

Full description

Saved in:
Bibliographic Details
Published inAIP advances Vol. 9; no. 5; pp. 055015 - 055015-6
Main Authors Liang, D. D., Wang, Y. J., Zhen, W. L., Yang, J., Weng, S. R., Yan, X., Han, Y. Y., Tong, W., Zhu, W. K., Pi, L., Zhang, C. J.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.05.2019
AIP Publishing LLC
Subjects
Anisotropy
Curvature
Electromagnetism
Hall effect
Magnetoresistance
Magnetoresistivity
Metalloids
Molybdenum compounds
Tellurides
Online AccessGet full text

Cover

More Information
Summary:Besides the negative longitudinal magnetoresistance (MR), planar Hall effect (PHE) is a newly emerging experimental tool to test the chiral anomaly or nontrivial Berry curvature in Weyl semimetals (WSMs). However, the origins of PHE in various systems are not fully distinguished and understood. Here we perform a systematic study on the PHE and anisotropic MR (AMR) of Td-MoTe2, a type-II WSM. Although the PHE and AMR curves can be well fitted by the theoretical formulas, we demonstrate that the anisotropic resistivity arises from the orbital MR (OMR), instead of the negative MR as expected in the chiral anomaly effect. In contrast, the positive MR indicates that the large OMR dominates over the chiral anomaly effect. This explains why it is difficult to measure negative MR in type-II WSMs. We argue that the measured PHE can be related with the chiral anomaly only when the negative MR is simultaneously observed.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5094231