The effects of dielectric disorder on van der Waals interactions in slab geometries

Details The effects of dielectric disorder on van der Waals interactions in slab geometries The effects of dielectric disorder on van der Waals interactions in slab geometries

2009-07-17

arxiv.org/abs/0907.3113v1

Phys. Rev. E 81, 051117 (2010)

Physics

Condensed Matter

Statistical Mechanics

15 pages, 9 figures, RevTex

Scientific paper

10.1103/PhysRevE.81.051117

We study the thermal Casimir effect between two thick slabs composed of plane-parallel layers of random dielectric materials interacting across an intervening homogeneous dielectric. It is found that the effective interaction at long distances is self averaging and its value is given by a that between non-random media with the effective dielectric tensor of the corresponding random media. The behavior at short distances becomes random (sample dependent) and is dominated by the local values of the dielectric constants proximal to each other across the homogeneous slab. These results are extended to the regime of intermediate slab separations by using perturbation theory for weak disorder and also by extensive numerical simulations for a number of systems where the dielectric function has a log-normal distribution.

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