4th Institute for Theoretical Physics, Universität Stuttgart, D-70569 Stuttgart, Germany.
Max Planck Institute for Intelligent Systems, D-70569 Stuttgart, Germany.
Phys Rev E. 2017 Jan;95(1-1):012151. doi: 10.1103/PhysRevE.95.012151. Epub 2017 Jan 26.
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 the individual dipole moments saturate in a strong field (a model that mimics the charges in a neutral, perfectly conducting sphere), we find that the resulting Casimir force depends strongly on the strength of the field, as demonstrated by analytical results. For a certain angle between the external field and center-to-center axis, the fluctuation force can be tuned and suppressed to arbitrarily small values. We compare the forces between these particles with those between particles with harmonic Hamiltonians and also provide a simple formula for asymptotically large external fields, which we expect to be generally valid for the case of saturating dipole moments.
我们研究了在外部电场作用下具有高度非谐偶极子哈密顿量的点粒子之间的经典 Casimir（或 van der Waals）力的热分量。使用一种模型，其中在强场中个体偶极子饱和（模拟中性、理想导电球体中的电荷的模型），我们发现分析结果表明，所得到的 Casimir 力强烈依赖于场的强度。对于外部场和中心到中心轴之间的某个角度，波动力可以被调谐和抑制到任意小的值。我们比较了这些粒子之间的力与具有谐波哈密顿量的粒子之间的力，并提供了一个简单的公式，用于渐近大的外部场，我们期望对于饱和偶极子的情况，该公式通常是有效的。
