Raman fingerprint for semi-metal WTe2 evolving from bulk to monolayer

Scientific Reports
Y C JiangL Wang

Abstract

Tungsten ditelluride (WTe2), a layered transition-metal dichalcogenide (TMD), has recently demonstrated an extremely large magnetoresistance effect, which is unique among TMDs. This fascinating feature seems to be correlated with its special electronic structure. Here, we report the observation of 6 Raman peaks corresponding to the , , , , and phonons, from the 33 Raman-active modes predicted for WTe2. This provides direct evidence to distinguish the space group of WTe2 from those of other TMDs. Moreover, the Raman evolution of WTe2 from bulk to monolayer is clearly revealed. It is interesting to find that the mode, centered at ~109.8 cm(-1), is forbidden in a monolayer, which may be attributable to the transition of the point group from C2v (bulk) to C2h (monolayer). Our work characterizes all observed Raman peaks in the bulk and few-layer samples and provides a route to study the physical properties of two-dimensional WTe2.

References

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Citations

Dec 30, 2016·Nano Letters·Enze ZhangFaxian Xiu
Feb 28, 2017·ACS Nano·George KakavelakisFrancesco Bonaccorso
Sep 9, 2016·Nanotechnology·Wei LuDong Sun
May 1, 2018·2d Materials·Carl H NaylorA T Charlie Johnson
Nov 6, 2018·Nano-micro Letters·Santanu MukherjeeGurpreet Singh
Nov 20, 2016·Advanced Materials·Jiadong ZhouZheng Liu
Jan 20, 2017·Nanotechnology·Xin LuoZhongming Zeng
Nov 26, 2015·Nature Communications·Lin WangAlberto F Morpurgo
Aug 29, 2018·Scientific Reports·Yujie LiuFengqiu Wang
Jun 17, 2020·Nature Communications·Alireza TaghizadehKristian S Thygesen
Aug 29, 2017·Small·Juan XiaZe-Xiang Shen
Jan 1, 2017·2d Materials·Sean M OliverPatrick M Vora
Mar 31, 2021·ACS Nano·Hagyeong KwonSuyeon Cho
Sep 19, 2019·Nano Letters·Sujay B DesaiAli Javey
Dec 4, 2021·Physical Chemistry Chemical Physics : PCCP·Marcos A PimentaBruno R Carvalho

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Methods Mentioned

BETA
atomic force microscopy
atomic-force microscopy

Software Mentioned

DFPT
CASTEP

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