1,183 research outputs found
Divacancy-induced Ferromagnetism in Graphene Nanoribbons
Zigzag graphene nanoribb ons have spin-polarized edges,
anti-ferromagnetically coupled in the ground state with total spin zero.
Customarily, these ribbons are made ferromagnetic by producing an imbalance
between the two sublattices. Here we show that zigzag ribbons can be
ferromagnetic due to the presence of reconstructed divacancies near one edge.
This effect takes place despite the divacancies are produced by removing two
atoms from opposite sublattices, being balanced before reconstruction to 5-8-5
defects. We demonstrate that there is a strong interaction between the
defect-localized and edge bands which mix and split away from the Fermi level.
This splitting is asymmetric, yielding a net edge spin-polarization. Therefore,
the formation of reconstructed divacancies close to the edges of the
nanoribbons can be a practical way to make them partially ferromagnetic
Opciones de tratamiento en la displasia de codo
La Displasia de Codo es una enfermedad poligénica del desarrollo, con diferentes grados de heredabilidad, que afecta a animales de razas grandes. En este artÃculo se detallan las diferentes formas de displasia de codo y una breve reseña de sus caracterÃsticas más destacables. Se hace mención especÃfica a las posibilidades terapéuticas para cada enfermedad en concreto y, en los casos en donde existe controversia, se realiza una breve discusión siempre tomando como base la medicina basada en la evidencia
Alteraciones meniscales y meniscectomÃa en casos de rotura de ligamentos cruzados
Se revisaron 21 casos de lesiones meniscales ocurridas en una serie de 38 roturas del ligamento cruzado anterior. Se describe la técnica utilizada para la extracción del menisco en estos casos, asà como las caracterÃsticas de las meniscopatÃas, incluyendo el tipo y la duración de la lesión.Twenty one cases of meniscallesions occurred in a series of 38 anterior cruciate ligament ruptures were reviewed. The technique used for meniscal excision is described, as well as sorne characteristics of the meniscopathies, including type and duration of the lesion
Topologically confined states at corrugations of gated bilayer graphene
We investigate the electronic and transport properties of gated bilayer
graphene with one corrugated layer, which results in a stacking AB/BA boundary.
When a gate voltage is applied to one layer, topologically protected gap states
appear at the corrugation, which reveal as robust transport channels along the
stacking boundary. With increasing size of the corrugation, more localized,
quantum-well-like states emerge. These finite-size states are also conductive
along the fold, but in contrast to the stacking boundary states, which are
gapless, they present a gap. We have also studied periodic corrugations in
bilayer graphene; our findings show that such corrugations between AB- and
BA-stacked regions behave as conducting channels that can be easily identified
by their shape
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