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29 March 2024 |
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Experimental observation of anisotropic Adler-Bell-Jackiw anomaly in type-II Weyl semimetal WTe$_2$ crystals | Yang-Yang Lv
; Xiao Li
; Bin-Bin Zhang
; Shu-Hua Yao
; Y. B. Chen
; Jian Zhou
; Shan-Tao Zhang
; Ming-Hui Lu
; Lei Zhang
; Ming-Liang Tian
; Yan-Feng Chen
; | Date: |
18 Aug 2016 | Abstract: | Adler-Bell-Jackiw (ABJ) anomaly, being a spectacular phenomenon in quantum
field theory, was recently observed in several Weyl semimetals. The latest
progress is the theoretical extension of Weyl semimetal to the type-II Weyl
semimetal. The electron dispersion in type-II Weyl semimetal disrupts the
honored Lorentz invariance, which theoretically hosts anisotropic transport
properties. Here we observe the significant anisotropic ABJ anomaly in the
Fermi-level delicately adjusted WTe$_2$ crystals. Quantitatively, $C_w$, a
coefficient representing intensity of ABJ anomaly, in a-axis and b-axis of
WTe$_2$ are 0.05066 and 0.03018 T$^{-2}$ at 2 K, respectively. In addition,
temperature-sensitive ABJ anomaly observed in our experiment maybe an indicator
of topological phase transition from type-II Weyl semimetal to trivial
semimetal, which is supported by first-principles calculation using
experimentally determined lattice parameters at different temperatures as the
input information. Our work suggests that electron-doped WTe$_2$ is an ideal
playground to explore the novel properties in type-II Weyl semimetals. | Source: | arXiv, 1608.5216 | Services: | Forum | Review | PDF | Favorites |
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