Anomalous vibrational modes in few layer WTe2 revealed by polarized Raman scattering and first-principles calculations
Abstract
When layered transition-metal dichalcogenides (TMDs) are scaled down from a three- to a two-dimensional geometry, electronic and structural transitions occur, leading to the emergence of properties not usually found in the bulk. Here, we report a systematic Raman study of exfoliated semi-metallic WTe2 flakes with thickness ranging from few layers down to a single layer. A dramatic change in the Raman spectra occurs between the monolayer and few-layer WTe2 as a vibrational mode centered at ~86.9 cm-1 in the monolayer splits into two active modes at 82.9 and 89.6 cm-1 in the bilayer. Davydov splitting of these two modes is found in the bilayer, as further evidenced by polarized Raman measurements. Strong angular dependence of Raman modes on the WTe2 film thickness reflects that the existence of directional interlayer interaction, rather than isotropic van der Waals (vdw) coupling, is playing an essential role affecting the phonon modes, especially in anisotropic 2D WTe2 material. Therefore, the strong evolution of Raman modes with thickness and polarization direction, can not only be a reliable fingerprint for the determination of the thickness and the crystallographic orientation, but can also be an ideal probe for such strong and directional interlayer interaction.
- Authors:
-
[3];
[2];
- Huazhong Univ. of Science and Technology, Wuhan (China)
- Rensselaer Polytechnic Inst., Troy, NY (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1376514
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- 2D Materials
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 3; Journal ID: ISSN 2053-1583
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Cao, Yan, Sheremetyeva, Natalya, Liang, Liangbo, Yuan, Hui, Zhong, Tingting, Meunier, Vincent, and Pan, Minghu. Anomalous vibrational modes in few layer WTe2 revealed by polarized Raman scattering and first-principles calculations. United States: N. p., 2017.
Web. doi:10.1088/2053-1583/aa7f5a.
Cao, Yan, Sheremetyeva, Natalya, Liang, Liangbo, Yuan, Hui, Zhong, Tingting, Meunier, Vincent, & Pan, Minghu. Anomalous vibrational modes in few layer WTe2 revealed by polarized Raman scattering and first-principles calculations. United States. https://doi.org/10.1088/2053-1583/aa7f5a
Cao, Yan, Sheremetyeva, Natalya, Liang, Liangbo, Yuan, Hui, Zhong, Tingting, Meunier, Vincent, and Pan, Minghu. Wed .
"Anomalous vibrational modes in few layer WTe2 revealed by polarized Raman scattering and first-principles calculations". United States. https://doi.org/10.1088/2053-1583/aa7f5a. https://www.osti.gov/servlets/purl/1376514.
@article{osti_1376514,
title = {Anomalous vibrational modes in few layer WTe2 revealed by polarized Raman scattering and first-principles calculations},
author = {Cao, Yan and Sheremetyeva, Natalya and Liang, Liangbo and Yuan, Hui and Zhong, Tingting and Meunier, Vincent and Pan, Minghu},
abstractNote = {When layered transition-metal dichalcogenides (TMDs) are scaled down from a three- to a two-dimensional geometry, electronic and structural transitions occur, leading to the emergence of properties not usually found in the bulk. Here, we report a systematic Raman study of exfoliated semi-metallic WTe2 flakes with thickness ranging from few layers down to a single layer. A dramatic change in the Raman spectra occurs between the monolayer and few-layer WTe2 as a vibrational mode centered at ~86.9 cm-1 in the monolayer splits into two active modes at 82.9 and 89.6 cm-1 in the bilayer. Davydov splitting of these two modes is found in the bilayer, as further evidenced by polarized Raman measurements. Strong angular dependence of Raman modes on the WTe2 film thickness reflects that the existence of directional interlayer interaction, rather than isotropic van der Waals (vdw) coupling, is playing an essential role affecting the phonon modes, especially in anisotropic 2D WTe2 material. Therefore, the strong evolution of Raman modes with thickness and polarization direction, can not only be a reliable fingerprint for the determination of the thickness and the crystallographic orientation, but can also be an ideal probe for such strong and directional interlayer interaction.},
doi = {10.1088/2053-1583/aa7f5a},
journal = {2D Materials},
number = 3,
volume = 4,
place = {United States},
year = {Wed Aug 02 00:00:00 EDT 2017},
month = {Wed Aug 02 00:00:00 EDT 2017}
}
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