Examinando por Autor "Emig, Thorsten"

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Casimir interaction between inclined metallic cylinders
(American Physical Society, 2012-03-12) Rodriguez-Lopez, Pablo; Emig, Thorsten
The Casimir interaction between one-dimensional metallic objects (cylinders, wires) displays unconventional features. Here we study the orientation dependence of this interaction by computing the Casimir energy between two inclined cylinders over a wide range of separations. We consider Dirichlet, Neumann, and perfect-metal boundary conditions, both at zero temperature and in the classical high-temperature limit. For all types of boundary conditions, we find that at large distances the interaction decays slowly with distance, similarly to the case of parallel cylinders, and at small distances scales as the interaction of two spheres (but with different numerical coefficients). Our numerical results at intermediate distances agree with our analytical predictions at small and large separations. Experimental implications are discussed.
Effect of curvature and confinement on the Casimir-Polder interaction
(American Physical Society, 2015-01-30) Rodriguez-Lopez, Pablo; Emig, Thorsten; Noruzifar, Ehsan; Zandi, Roya
Modifications of Casimir-Polder interactions due to confinement inside a cylindrical cavity and due to curvature in- and outside the cavity are studied. We consider a perfectly conducting cylindrical shell with a single particle (atom or macroscopic sphere) located next to its interior or exterior surface or two atoms placed inside the shell. By employing the scattering approach, we obtain the particle-cavity interaction and the modification of the two-particle interaction due to the cavity. We consider both retardation and thermal effects. While for the atoms a dipole description is sufficient, for the macroscopic sphere we sum (numerically) over many multipole fluctuations to compute the interaction at short separations. In the latter limit we make comparisons to the proximity approximation and a gradient expansion and find agreement. Our results indicate a confinement-induced suppression of the force between atoms. General criteria for suppression and enhancement of Casimir interactions due to confinement are discussed.