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 artículo se detallan las diferentes formas de displasia de codo y una breve reseña de sus características más destacables. Se hace mención específica 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

Interface States in Carbon Nanotube Junctions: Rolling up graphene

We study the origin of interface states in carbon nanotube intramolecular junctions between achiral tubes. By applying the Born-von Karman boundary condition to an interface between armchair- and zigzag-terminated graphene layers, we are able to explain their number and energies. We show that these interface states, costumarily attributed to the presence of topological defects, are actually related to zigzag edge states, as those of graphene zigzag nanoribbons. Spatial localization of interface states is seen to vary greatly, and may extend appreciably into either side of the junction. Our results give an alternative explanation to the unusual decay length measured for interface states of semiconductor nanotube junctions, and could be further tested by local probe spectroscopies

Alteraciones meniscales y meniscectomía 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, así como las características de las meniscopatías, 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