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The propagation of charge carriers in graphene under an imposed periodic potential can become strongly anisotropic, suggesting a way of making electronic circuits with appropriately patterned surface electrodes without the need for cutting nanoscale structure into graphene.
High-temperature superconductors are difficult to model because most conventional theories fail for the strong repulsive interactions between electrons. But what if the correlations are not as strong as believed? Perhaps the magnetic correlations are more essential.
Arrays of quantum dots can be useful for building ‘artificial molecules’, and potentially as elements of quantum information networks. But in practice, no two dots are the same. An optical technique provides the means for in situ characterization of individual dots, and their collective properties.