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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Out-of-plane excitons in two-dimensional crystals

Texto completo
Guilhon, I [1] ; Marques, M. [1] ; Teles, L. K. [1] ; Palummo, M. [2, 3] ; Pulci, O. [2, 3] ; Botti, Silvana [4] ; Bechstedt, F. [4]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Inst Tecnol Aeronaut, DCTA, Grp Mat Semicond & Nanotecnol, BR-12228900 Sao Jose Dos Campos - Brazil
[2] Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome - Italy
[3] Univ Roma Tor Vergata, Ist Nazl Fis Nucl, Via Ric Sci 1, I-00133 Rome - Italy
[4] Friedrich Schiller Univ, Inst Festkorpertheorie & Opt, Max Wien Pl 1, D-07743 Jena - Germany
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 99, n. 16 APR 9 2019.
Citações Web of Science: 4

Two-dimensional materials are ideal platforms to explore new physical phenomena and reveal unique optical properties. Excitonic and quasiparticle effects are strongly enhanced by the reduced screening. The response to a perturbing electromagnetic field is dominated by in-plane light polarization. The quantum confinement of the atomic sheets in normal direction also allows out-of-plane pair excitations, which are ruled by selection rules and local-field effects. We apply the GW approximation and the Bethe-Salpeter equation to investigate optical transitions for light polarization both parallel and normal to the atomic planes. Prototypical systems range from semimetals to large-gap insulators such as graphene, graphene oxide, boron nitride, and molybdenum disulfide. For the considered materials, the out-of-plane absorption edge and the first van Hove singularities are blueshifted in dependence of the effective sheet thickness, while the intensity of the optical conductivity is reduced by orders of magnitude. (AU)

Processo FAPESP: 12/50738-3 - Estudo de pontos quânticos através de cálculos de primeiros princípios
Beneficiário:Ronaldo Rodrigues Pelá
Linha de fomento: Auxílio à Pesquisa - Regular