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Pressure-Induced Phase Transition in Weyl Semimetallic WTe2

Pressure-Induced Phase Transition in Weyl Semimetallic WTe2
Jia-Dong Zhou, Zheng Liu, Dong-Fei Li, Hai-Bo Li, Juan Xia, Jia-Xu Yan, Jer-Lai Kuo, Peng Yu, Ze-Xiang Shen, Jun-Hao Lin
Tungsten ditelluride (WTe2) is a semimetal with orthorhombic Td phase that possesses some unique properties such as Weyl semimetal states, pressure-induced superconductivity, and giant magnetoresistance. Here, the high-pressure properties of WTe2 single crystals are investigated by Raman microspectroscopy and ab initio calculations. WTe2 shows strong plane-parallel/plane-vertical vibrational anisotropy, stemming from its intrinsic Raman tensor. Under pressure, the Raman peaks at ≈120 cm−1 exhibit redshift, indicating structural instability of the orthorhombic Td phase. WTe2 undergoes a phase transition to a monoclinic T′ phase at 8 GPa, where the Weyl states vanish in the new T′ phase due to the presence of inversion symmetry. Such Td to T′ phase transition provides a feasible method to achieve Weyl state switching in a single material without doping. The new T′ phase also coincides with the appearance of superconductivity reported in the literature. The plane-parallel/plane-vertical vibrational anisotropies of WTe2 single crystal under high pressure are investigated by Raman spectroscopy and ab initio calculations. WTe2 undergoes a phase transition from orthorhombic Td to monoclinic T′ phase at 8 GPa, where the Weyl states vanish in the new T′ phase due to the presence of inversion symmetry.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201701887

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