Probing combinations of acoustic phonons in MoS2 by intervalley double-resonance Raman scattering

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dc.creatorRafael Nunes Gontijo
dc.creatorAndreij de Carvalho Gadelha
dc.creatorOrlando José Silveira Júnior
dc.creatorRicardo Wagner Nunes
dc.creatorMarcos Assunção Pimenta
dc.creatorAriete Righi
dc.creatorCristiano Fantini Leite
dc.date.accessioned2023-06-28T12:27:36Z
dc.date.accessioned2025-09-08T22:51:16Z
dc.date.available2023-06-28T12:27:36Z
dc.date.issued2021
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetos
dc.description.sponsorshipINCT – Instituto nacional de ciência e tecnologia (Antigo Instituto do Milênio)
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.103.045411
dc.identifier.issn2469-9969
dc.identifier.urihttps://hdl.handle.net/1843/55454
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofPhysical Review B
dc.rightsAcesso Restrito
dc.subjectAnálise espectral
dc.subjectMetais de transição
dc.subjectFonons
dc.subject.otherRaman spectroscopy
dc.subject.otherPhonons
dc.titleProbing combinations of acoustic phonons in MoS2 by intervalley double-resonance Raman scattering
dc.typeArtigo de periódico
local.citation.epage045411-8
local.citation.issue4
local.citation.spage045411-1
local.citation.volume103
local.description.resumoIn this work, we present measurements of the temperature dependence of the resonance Raman spectra of MoS2 in two-dimensional and bulk forms, performed to identify the processes related to different combinations of two acoustic phonons involved in the intervalley scattering. The resonance Raman spectra of samples of different thicknesses (single layer, bilayer, trilayer, and bulk) were measured near the resonance with the A excitonic transition and at different temperatures. Measurements of the Raman spectra of bulk MoS2 were performed using several laser energies across the resonances with the A and B excitonic transitions. Based on the electronic and vibrational structures of the samples with different thicknesses and the evolution of the bands as a function of the laser excitation energy and temperature, we propose correct assignments to the Raman bands appearing at approximately 380, 395, and 405 cm−1 . According to our measurements and data analysis, the peaks at 380, 395, and 405 cm−1 correspond to the combinations of 2TA around the K point, LA and TA phonons around the M point, and LA and out-of-plane acoustic (ZA) phonons around the M point, respectively. This work sheds light on the double-resonance processes of MoS2 and how it is related to the electronic structure of this material. The results presented here establish the assignment and the scattering mechanism for some two-phonon and double-resonance Raman bands whose origins were still a matter of debate in the literature. It can also be an important basis to explain the double-resonance processes in other transition-metal dichalcogenides since we present the fundamental electron scattering mechanism near the resonance with the A and B excitonic transitions, and how it is affected by thermal effects.
local.identifier.orcidhttps://orcid.org/0000-0002-6335-483X
local.identifier.orcidhttps://orcid.org/0000-0002-6350-7680
local.identifier.orcidhttps://orcid.org/0000-0002-0403-9485
local.identifier.orcidhttps://orcid.org/0000-0003-2810-8649
local.identifier.orcidhttps://orcid.org/0000-0002-3389-0682
local.identifier.orcidhttps://orcid.org/0000-0001-8752-9609
local.identifier.orcidhttps://orcid.org/0000-0003-0436-7857
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.045411

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