Anomalous in-plane anisotropic Raman response of monoclinic semimetal 1 T´-MoTe 2

Abstract The recently discovered two-dimensional (2D) semimetal 1 T´-MoTe2 exhibits colossal magnetoresistance and superconductivity, driving a strong research interest in the material’s quantum phenomena. Unlike the typical hexagonal structure found in many 2D materials, the 1 T´-MoTe2 lattice has...

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Autores principales:	Qingjun Song, Haifeng Wang, Xingchen Pan, Xiaolong Xu, Yilun Wang, Yanping Li, Fengqi Song, Xiangang Wan, Yu Ye, Lun Dai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f95ebfa0c9364c64bcec62273a157574
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spelling	oai:doaj.org-article:f95ebfa0c9364c64bcec62273a1575742021-12-02T15:06:07ZAnomalous in-plane anisotropic Raman response of monoclinic semimetal 1 T´-MoTe 210.1038/s41598-017-01874-22045-2322https://doaj.org/article/f95ebfa0c9364c64bcec62273a1575742017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01874-2https://doaj.org/toc/2045-2322Abstract The recently discovered two-dimensional (2D) semimetal 1 T´-MoTe2 exhibits colossal magnetoresistance and superconductivity, driving a strong research interest in the material’s quantum phenomena. Unlike the typical hexagonal structure found in many 2D materials, the 1 T´-MoTe2 lattice has strong in-plane anisotropy. A full understanding of the anisotropy is necessary for the fabrication of future devices which may exploit these quantum and topological properties, yet a detailed study of the material’s anisotropy is currently lacking. While angle resolved Raman spectroscopy has been used to study anisotropic 2D materials, such as black phosphorus, there has been no in-depth study of the Raman dependence of 1 T´-MoTe2 on different layer numbers and excitation energies. Here, our angle resolved Raman spectroscopy shows intricate Raman anisotropy dependences of 1 T´-MoTe2 on polarization, flake thickness (from single layer to bulk), photon, and phonon energies. Using a Paczek approximation, the anisotropic Raman response can be captured in a classical framework. Quantum mechanically, first-principle calculations and group theory reveal that the anisotropic electron-photon and electron-phonon interactions are nontrivial in the observed responses. This study is a crucial step to enable potential applications of 1 T´-MoTe2 in novel electronic and optoelectronic devices where the anisotropic properties might be utilized for increased functionality and performance.Qingjun SongHaifeng WangXingchen PanXiaolong XuYilun WangYanping LiFengqi SongXiangang WanYu YeLun DaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Qingjun Song Haifeng Wang Xingchen Pan Xiaolong Xu Yilun Wang Yanping Li Fengqi Song Xiangang Wan Yu Ye Lun Dai Anomalous in-plane anisotropic Raman response of monoclinic semimetal 1 T´-MoTe 2
description	Abstract The recently discovered two-dimensional (2D) semimetal 1 T´-MoTe2 exhibits colossal magnetoresistance and superconductivity, driving a strong research interest in the material’s quantum phenomena. Unlike the typical hexagonal structure found in many 2D materials, the 1 T´-MoTe2 lattice has strong in-plane anisotropy. A full understanding of the anisotropy is necessary for the fabrication of future devices which may exploit these quantum and topological properties, yet a detailed study of the material’s anisotropy is currently lacking. While angle resolved Raman spectroscopy has been used to study anisotropic 2D materials, such as black phosphorus, there has been no in-depth study of the Raman dependence of 1 T´-MoTe2 on different layer numbers and excitation energies. Here, our angle resolved Raman spectroscopy shows intricate Raman anisotropy dependences of 1 T´-MoTe2 on polarization, flake thickness (from single layer to bulk), photon, and phonon energies. Using a Paczek approximation, the anisotropic Raman response can be captured in a classical framework. Quantum mechanically, first-principle calculations and group theory reveal that the anisotropic electron-photon and electron-phonon interactions are nontrivial in the observed responses. This study is a crucial step to enable potential applications of 1 T´-MoTe2 in novel electronic and optoelectronic devices where the anisotropic properties might be utilized for increased functionality and performance.
format	article
author	Qingjun Song Haifeng Wang Xingchen Pan Xiaolong Xu Yilun Wang Yanping Li Fengqi Song Xiangang Wan Yu Ye Lun Dai
author_facet	Qingjun Song Haifeng Wang Xingchen Pan Xiaolong Xu Yilun Wang Yanping Li Fengqi Song Xiangang Wan Yu Ye Lun Dai
author_sort	Qingjun Song
title	Anomalous in-plane anisotropic Raman response of monoclinic semimetal 1 T´-MoTe 2
title_short	Anomalous in-plane anisotropic Raman response of monoclinic semimetal 1 T´-MoTe 2
title_full	Anomalous in-plane anisotropic Raman response of monoclinic semimetal 1 T´-MoTe 2
title_fullStr	Anomalous in-plane anisotropic Raman response of monoclinic semimetal 1 T´-MoTe 2
title_full_unstemmed	Anomalous in-plane anisotropic Raman response of monoclinic semimetal 1 T´-MoTe 2
title_sort	anomalous in-plane anisotropic raman response of monoclinic semimetal 1 t´-mote 2
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/f95ebfa0c9364c64bcec62273a157574
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_version_	1718388620728991744

Anomalous in-plane anisotropic Raman response of monoclinic semimetal 1 T´-MoTe 2

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