We study the role of surface polaritons in the zero-temperature Casimir effect between two graphene layers that are described by the Dirac model. A parametric approach allows us to accurately calculate the dispersion relations of the relevant modes and to evaluate their contribution to the total Casimir energy. The resulting force features a change of sign from attractive to repulsive as the distance between the layers increases. Contrary to similar calculations that have been performed for metallic plates, our asymptotic analysis demonstrates that at small separations the polaritonic contribution becomes negligible relative to the total energy.
QuaCa is an extensible library facilitating the computation of steady-state atom-surface quantum friction. Due to its modular domain-driven structure, QuaCa can be of further use to calculate relevant quantities that are often needed in the context of electromagnetic dispersion forces. Quantum (or Casimir) friction is a quantum-optical fluctuation-induced force that occurs in dynamical nonequilibrium, i.e. when a number of bodies are moving relative to one another (Pendry, 1997;Scheel & Buhmann, 2009). The frictional interaction between the moving system of interest and its environment is mediated by the (material-modified) quantum vacuum and persists even at zero temperature. At finite temperatures, thermal fluctuations can modify the interaction and quantum friction can be connected to the Einstein-Hopf effect
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