Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 3: Quantum Effects: QED I

Q 3.2: Vortrag

Montag, 6. März 2017, 14:45–15:00, P 4

Casimir forces in media: comparison of microscopic and macroscopic descriptions — •Friedrich Burger, Johannes Fiedler, and Stefan Yoshi Buhmann — Institute of Physics, University of Freiburg, Germany

We consider the Casimir force between two dielectric bodies in a medium, motivated by a recent debate initiated by Raabe and Welsch [1]: the Casimir force as an effective electromagnetic force on a dieletric object due to a second object can be expressed as a surface integral over a stress tensor. Two alternative choices, the Maxwell stress tensor [1] on the one hand and the Abraham-Minkowski stress tensor [2] on the other, then lead to different results when the objects are embedded in a medium. We analyse a setup of two dielectric spheres within a medium [3] and present a comparison of both approaches with the result obtained from microscopic Hamaker theory [4].

[1] C. Raabe and D.-G. Welsch, Phys. Rev. A 71, 013814 (2005).
I. Dzyaloshinskii, E. M. Lifshitz and L. P. Pitaevskii, Adv. Phys. 10 165 (1961).
A. Sambale, S. Y. Buhmann and S. Scheel, Phys. Rev. A 81, 012509 (2010).
H. C. Hamaker, Physica 4, 1058 (1937).