Kim, Younghee Jhon, Young In Park, June Kim, Jae Hun Lee, Seok Jhon, Young Min 2024-01-20T05:04:45Z 2024-01-20T05:04:45Z 2021-09-03 2016-01 2040-3364 https://pubs.kist.re.kr/handle/201004/124579 Tungsten ditelluride (WTe2) is a layered material that exhibits excellent magnetoresistance and thermoelectric behaviors, which are deeply related with its distorted orthorhombic phase that may critically affect the lattice dynamics of this material. Here, we report comprehensive characterization of Raman spectra of WTe2 from bulk to monolayer using experimental and computational methods. We find that mono and bi-layer WTe2 are easily identified by Raman spectroscopy since two or one Raman modes that are observed in higher-layer WTe2 are greatly suppressed below the noise level in the mono-and bi-layer WTe2, respectively. In addition, the frequency of in-plane A(1)(7) mode of WTe2 remains almost constant as the layer number decreases, while all the other Raman modes consistently blueshift, which is completely different from the vibrational behavior of hexagonal metal dichalcogenides. First-principles calculation validates experimental results and reveals that anomalous lattice vibrations in WTe2 are attributed to the formation of tungsten chains that make WTe2 structurally one-dimensional. English ROYAL SOC CHEMISTRY MONOLAYER MOS2 MODE PHOTOLUMINESCENCE TRANSISTORS BULK WS2 Anomalous Raman scattering and lattice dynamics in mono- and few-layer WTe2 Article 10.1039/c5nr06098b 1 NANOSCALE, v.8, no.4, pp.2309 - 2316 NANOSCALE 8 4 2309 2316 scie scopus 000368860900065 2-s2.0-84955506270 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article MONOLAYER MOS2 MODE PHOTOLUMINESCENCE TRANSISTORS BULK WS2 Raman lattice WTe2