An isostatic lattice is one at the threshold of mechanical stability. The square and kagome lattices (see Figure 1a-b) in two dimensions are examples of isostatic lattices. A 2D kagome lattice of N sites has of order N1/2 zero-energy bulk modes under periodic boundary conditions.
Background: The JHU MRSEC conducts extensive K-12 educational outreach programs aimed at promoting interest in and awareness of the importance of modern materials
Background: A bar magnet has two poles, denoted as +1 and -1 magnetic charges. Patterned structures consist of many magnets (Fig. 1), where the square array (Fig. 1a) does not, whereas the honeycomb (Fig. 1b) has, net magnetic charges (or magnetic monopoles). Under a magnetic field these local magnetic monopoles will move (Fig. 1c).
Background: The tetrahedral coordination of Fe surrounded by 4 Se(Te) atoms is of crucial importance for the new high TC Fe pnictides superconductors with lattice parameters c and a. To
Graphene in its pristine form is one of the strongest materials, but defects influence its strenth. Using atomistic calculations, we find that, counter to standard reasoning, graphene sheets with large-angle tilt boundaries that have a high density of defects are as strong as the pristine material and unexpectedly are much stronger than those with low-angle boundaries having fewer defects. We
Replacing steel with lightweight Aluminum alloys could significantly improve fuel economy of vehicles. Existing lightweight alloys are difficult to use, because they have poor ductility, and tend to tear while they are stamped to form a complex part. Adding small quantities of additional allying elements to lightweight alloys could improve their ductility. But at present the only way to iden
Doping semiconductor nanocrystals with transition metals is an efficient route to tune emission color over a broad range of
Interacting electron ripples provide clues to superconductivity A theoretical prediction is confirmed by atomic-scale microscopy
