84 research outputs found
Taxonomia e distribuição de Cheilolejeunea aneogyna (Spruce) A. Evans (Lejeuneaceae, Marchantiophyta)
Exciton swapping in a twisted graphene bilayer as a solid-state realization of a two-brane model
It is shown that exciton swapping between two graphene sheets may occur under
specific conditions. A magnetically tunable optical filter is described to
demonstrate this new effect. Mathematically, it is shown that two turbostratic
graphene layers can be described as a "noncommutative" two-sheeted
(2+1)-spacetime thanks to a formalism previously introduced for the study of
braneworlds in high energy physics. The Hamiltonian of the model contains a
coupling term connecting the two layers which is similar to the coupling
existing between two braneworlds at a quantum level. In the present case, this
term is related to a K-K' intervalley coupling. In addition, the experimental
observation of this effect could be a way to assess the relevance of some
theoretical concepts of the braneworld hypothesis.Comment: 15 pages, 3 figures, final version published in European Physical
Journal
Stereological study of the elastic fiber and smooth muscle cell system in the bovine and buffalo penis
Novas referências de hepáticas (Marchantiophyta) da Floresta Nacional de Caxiuanã para o Estado do Pará, Brasil
Tabelas de esperança de vida e fertilidade de Myzus persicae sobre pimentão em laboratório e casa de vegetação
Utilização de dados parciais na seleção de codornas de corte para produção de ovos
Manejo e viabilidade econômica da irrigação por gotejamento na cultura do cafeeiro acaiá considerando seis safras
- …