Particles with nonlinear electric response: Suppressing van der Waals forces by an external field.

摘要: We study the classical thermal component of Casimir, or van der Waals, forces between point particles with highly anharmonic dipole Hamiltonians when they are subjected to an external electric field. Using a model for which individual moments saturate in strong field (a that mimics charges neutral, perfectly conducting sphere), we find resulting Casimir force depends strongly on strength field, as demonstrated by analytical results. For certain angle and center-to-center axis, fluctuation can be tuned suppressed arbitrarily small values. compare these those harmonic also provide simple formula asymptotically large fields, expect generally valid case saturating moments.