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29 March 2024
 
  » arxiv » 1608.5216

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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
AbstractAdler-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
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