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dc.creatorRibeiro-Soares, J.-
dc.creatorAlmeida, R. M.-
dc.creatorBarros, E. B.-
dc.creatorAraujo, P. T.-
dc.creatorDresselhaus, M. S.-
dc.creatorCançado, L. G.-
dc.creatorJorio, A.-
dc.date.accessioned2019-11-28T16:50:06Z-
dc.date.available2019-11-28T16:50:06Z-
dc.date.issued2014-
dc.identifier.citationRIBEIRO-SOARES, J. et al. Group theory analysis of phonons in two-dimensional transition metal dichalcogenides. Physical Review B, New York, v. 90, n. 11, 2014. DOI: https://doi.org/10.1103/PhysRevB.90.115438.pt_BR
dc.identifier.urihttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.90.115438pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/37830-
dc.description.abstractTransition metal dichalcogenides (TMDCs) have emerged as a new two-dimensional material’s field since the monolayer and few-layer limits show different properties when compared to each other and to their respective bulk materials. For example, in some cases when the bulk material is exfoliated down to a monolayer, an indirect-to-direct band gap in the visible range is observed. The number of layers N (N even or odd) drives changes in space-group symmetry that are reflected in the optical properties. The understanding of the space-group symmetry as a function of the number of layers is therefore important for the correct interpretation of the experimental data. Here we present a thorough group theory study of the symmetry aspects relevant to optical and spectroscopic analysis, for the most common polytypes of TMDCs, i.e., 2H a, 2H c and 1T , as a function of the number of layers. Real space symmetries, the group of the wave vectors, the relevance of inversion symmetry, irreducible epresentations of the vibrational modes, optical activity, and Raman tensors are discussed.pt_BR
dc.languageen_USpt_BR
dc.publisherAmerican Physical Societypt_BR
dc.rightsrestrictAccesspt_BR
dc.sourcePhysical Review Bpt_BR
dc.subjectTransition metal dichalcogenidespt_BR
dc.subjectDicalcogenetos de metais de transiçãopt_BR
dc.titleGroup theory analysis of phonons in two-dimensional transition metal dichalcogenidespt_BR
dc.typeArtigopt_BR
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