Origin of planar Hall effect in type-II Weyl semimetal MoTe2
| Autor: | W. K. Zhu, Yong Wang, D. D. Liang, Changjin Zhang, J.C. Yang, Li Pi, Wei-Li Zhen, Wei Tong, Shirui Weng, Y. Y. Han, Xinsheng Yan |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Chiral anomaly Physics Condensed Matter - Materials Science Condensed matter physics Magnetoresistance Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy Weyl semimetal 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Measure (mathematics) Chirality (electromagnetism) lcsh:QC1-999 Hall effect 0103 physical sciences Berry connection and curvature 0210 nano-technology Anisotropy lcsh:Physics |
| Zdroj: | AIP Advances, Vol 9, Iss 5, Pp 055015-055015-6 (2019) |
| ISSN: | 2158-3226 |
| DOI: | 10.1063/1.5094231 |
| Popis: | 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 absence of negative 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. Comment: 14 pages, 4 figures |
| Databáze: | OpenAIRE |
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