/   Home   /   Newsroom   /   Research News

SHMFF Users Observe Adler-Bell-Jackiw Anomaly in Type-II Weyl Semimetal

Mar 20, 2017     Email"> PrintText Size

Using the low temperature X-ray diffraction (XRD) at High Magnetic Field Laboratory, Chinese Academy of Sciences(CHMFL), a research group in Najing University observed Anisotropic Adler-Bell-Jackiw (ABJ) anomaly in Type-II Weyl semimetal WTe1.98 crystals at the Quasi-classical Regime.

It provides experimental evidence of an anisotropic ABJ anomaly in a type-II Weyl semimetal.

Recognized as a remarkable phenomenon, ABJ anomaly originates from the breaking of chiral symmetry in the massless Weyl fermion under quantum fluctuation, which was mainly observed in high-energy particle physics and only recently in Weyl semimetals

The observation of negative magnetoresistance (MR) along the b axis in electrical-gated WTe2 few-layered samples was reported recently.

Thus a natural question is whether one can dope-electrons into a WTe2  crystal to observe the ABJ anomaly, more specifically, a permanent ABJ anomaly rather than a temporary one under electrical gating.

In this study, the team adjusted the Fermi level of WTe2 delicately through electron-doping by adjusting the deficiency of Te and observed the anisotropy negative MR effect in the WTe1.8 crystal.

They found that the temperature-sensitive ABJ anomaly is attributed to a topological phase transition from a type-II Weyl semimetal to a trivial semimetal, which is verified by a first-principles calculation using experimentally determined lattice parameters at different temperatures.

Theoretical electrical transport study reveals that the observation of an anisotropic ABJ along both a axis and b axis in WTe1.98 is attributed to electrical transport in the quasiclassical regime.

Their work suggested that electron-doped WTe2 is an ideal playground to explore the novel properties in type-II Weyl semimetals.

The work was supported by the low temperature X-ray diffraction (XRD) facility, a measurement system of the Steady High Magnet Field Facility (SHMFF) at CHMFL.

Their discovery have been published in Physical Review Letters with title Experimental Observation of Anisotropic Adler-Bell-Jackiw Anomaly in Type-II Weyl Semimetal WTe1.98 Crystals at the Quasiclassical Regime.


The temperature dependence of crystal structure change: (a) the XRD pattern for WTe1.8 at low temperature of 35K (the inset shows the crystal structure); (b) the temperature dependence of lattice constants of WTe1.8. (Image by ZHANG Lei)


(Editor: ZHANG Nannan)



High Magnetic Field Laboratory

Phone: 86-551-65595141
E-mail: zhanglei@hmfl.ac.cn

Related Articles

imaging platform;chemotherapheutic response of tumor;Casp3/7;magnetic resonance imaging;MR;magnetic resonance;tumor

Researchers Develop a New Imaging Platform for Evaluating Chemotherapeutic Response of Tumor

Apr 06, 2016

Prof. LIANG Gaolin's group at the Department of Chemistry of the University of Science and Technology of China (USTC) of Chinese Academy of Sciences (CAS), by collaborating with Prof. ZHONG Kai's group at the High Magnetic Field Laboratory of CAS, made big progress in dev...


Studies decode crystal structure of a neurotrophic factor

Jul 10, 2008

Contact Us

Copyright © 2002 - Chinese Academy of Sciences