Size quantization effects in thin film Casimir interaction

Abstract

We investigate the role of size quantization in the vacuum force between metallic films of nanometric thickness. The force is calculated by the Lifshitz formula with the film dielectric tensor derived from the one-electron energies and wavefunctions under the assumption of a constant potential inside the film and a uniform distribution of the positive ion charge. The results show that quantization effects tend to reduce the force with respect to the continuum plasma model. The reduction is more significant at low electron densities and for film size of the order of few nanometers and persists for separation distances up to 10 nm. Comparison with previous work indicates that the softening of the boundary potential is important in determining the amount of the reduction. The calculations are extended to treat Drude intraband absorption. It is shown that the inclusion of relaxation time enhances the size quantization effects in the force calculations.

References in corpus (11)

• Precise comparison of theory and new experiment for the Casimir force leads to stronger constraints on thermal quantum effects and long-range interactions
• Violation of the Nernst heat theorem in the theory of thermal Casimir force between Drude metals
• On the Temperature Dependence of the Casimir Effect
• Thermal corrections to the Casimir effect
• Observation of the skin-depth effect on the Casimir force between metallic surfaces
• Influence of slab thickness on the Casimir force
• Comment on "On the temperature dependence of the Casimir effect"
• What is the Temperature Dependence of the Casimir Effect?
• Self-consistent study of electron confinement to metallic thin films on solid surfaces
• Vacuum fluctuation forces between ultra-thin films
• A study of the electromagnetic fluctuation induced forces on thin metallic films