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17 papers · 1 filter
Implementation and testing of Lanczos-based algorithms for Random-Phase Approximation eigenproblems
Myrta Grüning, Andrea Marini, Xavier Gonze
The treatment of the Random-Phase Approximation Hamiltonians, encountered in different frameworks, like Time-Dependent Density Functional Theory or Bethe-Salpeter equation, is comp…
Vortex and gap generation in gauge models of graphene
O. Oliveira, C. E. Cordeiro, A. Delfino +2
Effective quantum field theoretical continuum models for graphene are investigated. The models include a complex scalar field and a vector gauge field. Different gauge theories are…
Dynamical gap generation in graphene nanoribbons: An effective relativistic field theoretical model
A. J. Chaves, G. D. Lima, W. de Paula +4
We show that the assumption of a nontrivial zero band gap for a graphene sheet within an effective relativistic field theoretical model description of interacting Dirac electrons o…
Comment on "Repulsive Casimir Force in Chiral Metamaterials"
M. G. Silveirinha, S. I. Maslovski
It is shown that the proposal of Ref. [1] of Casimir repulsion and nanolevitation based on chiral metamaterials is incompatible with the passivity and causality of the materials.
Superlens made of a metamaterial with extreme effective parameters
M. G. Silveirinha, C. A. Fernandes, J. R. Costa
We propose a superlens formed by an ultra-dense array of crossed metallic wires. It is demonstrated that due to the anomalous interaction between crossed wires, the structured subs…
Cluster-surface and cluster-cluster interactions: Ab initio calculations and modeling of van der Waals forces
Silvana Botti, Alberto Castro, Xavier Andrade +2
We present fully ab-initio calculations of van der Waals coefficients for two different situations: i) the interaction between hydrogenated silicon clusters; and ii) the interactio…