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Activation of new Raman modes by inversion symmetry breaking in type II Weyl semimetal candidate T'-MoTe2

We synthesized distorted octahedral(T') molybdenum ditelluride (MoTe2) and investigated its vibrational properties with Raman spectroscopy, density functional theory and symmetry analysis. Compared to the results from high temperature centrosymmetric monoclinic (T'mo) phase, four new Raman bands eme... Full description

Journal Title: arXiv.org Aug 19, 2016
Main Author: Shao-Yu, Chen
Other Authors: Goldstein, Thomas , Venkataraman, Dhandapani , Ramasubramaniam, Ashwin , Yan, Jun
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: DOI: 10.1021/acs.nanolett.6b02666
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recordid: proquest2079295735
title: Activation of new Raman modes by inversion symmetry breaking in type II Weyl semimetal candidate T'-MoTe2
format: Article
creator:
  • Shao-Yu, Chen
  • Goldstein, Thomas
  • Venkataraman, Dhandapani
  • Ramasubramaniam, Ashwin
  • Yan, Jun
subjects:
  • Phase Transitions
  • Spectrum Analysis
  • Symmetry
  • Crystal Structure
  • Gauges
  • Temperature Dependence
  • Tellurides
  • Broken Symmetry
  • Chains
  • Shear
  • Raman Spectroscopy
  • Density Functional Theory
  • Fermions
  • High Temperature
  • Molybdenum Compounds
  • Low Energy
  • Phase Transitions
ispartof: arXiv.org, Aug 19, 2016
description: We synthesized distorted octahedral(T') molybdenum ditelluride (MoTe2) and investigated its vibrational properties with Raman spectroscopy, density functional theory and symmetry analysis. Compared to the results from high temperature centrosymmetric monoclinic (T'mo) phase, four new Raman bands emerge in the low temperature orthorhombic (T'or) phase, which was recently predicted to be a type II Weyl semimetal. Crystal-angle-dependent, light-polarization-resolved measurements indicate that all the observed Raman peaks belong to two categories: those vibrating along the zigzag Mo atomic chain (z-mode) and those vibrating in the mirror plane (m-mode) perpendicular to the zigzag chain. Interestingly the low energy shear z-mode and shear m-mode, absent from the T'mo spectra, become activated when sample cooling induces a phase transition to the T'or crystal structure. We interpret this observation as a consequence of inversion-symmetry breaking, which is crucial for the existence of Weyl fermions...
language: eng
source:
identifier: DOI: 10.1021/acs.nanolett.6b02666
fulltext: fulltext_linktorsrc
url: Link


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titleActivation of new Raman modes by inversion symmetry breaking in type II Weyl semimetal candidate T'-MoTe2
creatorShao-Yu, Chen ; Goldstein, Thomas ; Venkataraman, Dhandapani ; Ramasubramaniam, Ashwin ; Yan, Jun
contributorYan, Jun (pacrepositoryorg)
ispartofarXiv.org, Aug 19, 2016
identifierDOI: 10.1021/acs.nanolett.6b02666
subjectPhase Transitions ; Spectrum Analysis ; Symmetry ; Crystal Structure ; Gauges ; Temperature Dependence ; Tellurides ; Broken Symmetry ; Chains ; Shear ; Raman Spectroscopy ; Density Functional Theory ; Fermions ; High Temperature ; Molybdenum Compounds ; Low Energy ; Phase Transitions
descriptionWe synthesized distorted octahedral(T') molybdenum ditelluride (MoTe2) and investigated its vibrational properties with Raman spectroscopy, density functional theory and symmetry analysis. Compared to the results from high temperature centrosymmetric monoclinic (T'mo) phase, four new Raman bands emerge in the low temperature orthorhombic (T'or) phase, which was recently predicted to be a type II Weyl semimetal. Crystal-angle-dependent, light-polarization-resolved measurements indicate that all the observed Raman peaks belong to two categories: those vibrating along the zigzag Mo atomic chain (z-mode) and those vibrating in the mirror plane (m-mode) perpendicular to the zigzag chain. Interestingly the low energy shear z-mode and shear m-mode, absent from the T'mo spectra, become activated when sample cooling induces a phase transition to the T'or crystal structure. We interpret this observation as a consequence of inversion-symmetry breaking, which is crucial for the existence of Weyl fermions...
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titleActivation of new Raman modes by inversion symmetry breaking in type II Weyl semimetal candidate T'-MoTe2
descriptionWe synthesized distorted octahedral(T') molybdenum ditelluride (MoTe2) and investigated its vibrational properties with Raman spectroscopy, density functional theory and symmetry analysis. Compared to the results from high temperature centrosymmetric monoclinic (T'mo) phase, four new Raman bands emerge in the low temperature orthorhombic (T'or) phase, which was recently predicted to be a type II Weyl semimetal. Crystal-angle-dependent, light-polarization-resolved measurements indicate that all the observed Raman peaks belong to two categories: those vibrating along the zigzag Mo atomic chain (z-mode) and those vibrating in the mirror plane (m-mode) perpendicular to the zigzag chain. Interestingly the low energy shear z-mode and shear m-mode, absent from the T'mo spectra, become activated when sample cooling induces a phase transition to the T'or crystal structure. We interpret this observation as a consequence of inversion-symmetry breaking, which is crucial for the existence of Weyl fermions...
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titleActivation of new Raman modes by inversion symmetry breaking in type II Weyl semimetal candidate T'-MoTe2
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abstractWe synthesized distorted octahedral(T') molybdenum ditelluride (MoTe2) and investigated its vibrational properties with Raman spectroscopy, density functional theory and symmetry analysis. Compared to the results from high temperature centrosymmetric monoclinic (T'mo) phase, four new Raman bands emerge in the low temperature orthorhombic (T'or) phase, which was recently predicted to be a type II Weyl semimetal. Crystal-angle-dependent, light-polarization-resolved measurements indicate that all the observed Raman peaks belong to two categories: those vibrating along the zigzag Mo atomic chain (z-mode) and those vibrating in the mirror plane (m-mode) perpendicular to the zigzag chain. Interestingly the low energy shear z-mode and shear m-mode, absent from the T'mo spectra, become activated when sample cooling induces a phase transition to the T'or crystal structure. We interpret this observation as a consequence of inversion-symmetry breaking, which is crucial for the existence of Weyl fermions...
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