Sven Stafström

TL;DR: In this paper, the authors present optical-absorption data together with band-structure calculations for the polaron lattice and bipolaron lattice for the highly conducting form of polyaniline, proton-doped polyemeraldine.

TL;DR: In this paper, the authors found that negative Poisson's ratio is rare in crystalline solids and showed that the existence of positive Poisson ratios up to the stability limit of 2 for cubic crystals in the orthogonal lateral direction.

TL;DR: In this article, the buckled and curved basal planes were found to have a distorted graphitel-like microstructure, and the buckling is due to the incorporation of pentagons in the basal planes, giving rise to a fullerenelike micro-structure.

TL;DR: In this paper, a band unfolding technique was used to recover an effective primitive cell picture of the band structure of graphene under the influence of different types of perturbations, which involves intrinsic p...

TL;DR: Rare crystal phases that expand in one or more dimensions when hydrostatically compressed are identified and shown to have negative Poisson's ratios, which may be used to fabricate porous solids that either expand in all directions when hydroStatically compressed with a penetrating fluid or behave as if they are incompressible.