Intralayer and interlayer electron-phonon interactions in twisted graphene heterostructures

Autor(es):Mostrar menos -

Eliel, G. S. N. ^[1] ; Moutinho, M. V. O. ^{[2, 3]} ; Gadelha, A. C. ^[1] ; Righi, A. ^[1] ; Campos, L. C. ^[1] ; Ribeiro, H. B. ^[4] ; Chiu, Po-Wen ^[5] ; Watanabe, K. ^[6] ; Taniguchi, T. ^[6] ; Puech, P. ^[7] ; Paillet, M. ^[8] ; Michel, T. ^[8] ; Venezuela, P. ^[2] ; Pimenta, M. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG - Brazil

^[2] Univ Fed Fluminense, Inst Fis, BR-24210346 Niteroi, RJ - Brazil

^[3] Nucleo Multidisciplinar Pesquisas Comp NUMPEX COM, BR-25245390 Duque De Caxias, RJ - Brazil

^[4] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, BR-01302907 Sao Paulo - Brazil

^[5] Natl Tsing Hua Univ, Hsinchu 30013 - Taiwan

^[6] Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3050044 - Japan

^[7] Univ Toulouse, CNRS, CEMES, F-31055 Toulouse - France

^[8] Univ Montpellier, CNRS, Lab Charles Coulomb, F-34095 Montpellier - France

• Tipo de documento: Artigo Científico
• Fonte: NATURE COMMUNICATIONS; v. 9, MAR 23 2018.
• Citações Web of Science: 8

Resumo

The understanding of interactions between electrons and phonons in atomically thin heterostructures is crucial for the engineering of novel two-dimensional devices. Electron-phonon (el-ph) interactions in layered materials can occur involving electrons in the same layer or in different layers. Here we report on the possibility of distinguishing intralayer and interlayer el-ph interactions in samples of twisted bilayer graphene and of probing the intralayer process in graphene/h-BN by using Raman spectroscopy. In the intralayer process, the el-ph scattering occurs in a single graphene layer and the other layer (graphene or h-BN) imposes a periodic potential that backscatters the excited electron, whereas for the interlayer process the el-ph scattering occurs between states in the Dirac cones of adjacent graphene layers. Our methodology of using Raman spectroscopy to probe different types of el-ph interactions can be extended to study any kind of graphene-based heterostructure. (AU)

• Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
• Beneficiário: Antônio Hélio de Castro Neto
• Linha de fomento: Auxílio à Pesquisa - Programa SPEC