Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 3: Quantum Effects: QED I
Q 3.3: Vortrag
Montag, 6. März 2017, 15:00–15:15, P 4
Dispersion forces in inhomogenous media — •Johannes Fiedler1, Priyadarshini Thiyam2, Mathias Boström2, Michael Walter1,3, and Stefan Yoshi Buhmann1 — 1Institute of Physics, University of Freiburg, Germany — 2Department of Materials Science and Engineering, Royal Institute of Technology, Sweden — 3Fraunhofer Institute for Mechanics of Materials, Germany
Dispersion forces, such as Casimir forces between dielectric bodies and van der Waals forces between neutral particles, are a consequence of the ground-state fluctuations of the electromagnetic field [1]. In modern precision experiments and theories, these forces are usually studied in vacuum [2]. However, typical realistic systems arising in nature, e.g. in biological contexts, often involve particles embedded in liquid solvent media. The latter can strongly modify the van der Waals interaction. Due to the Pauli blocking the solvent forms a void, or real cavity, around the particles [3], which has to be taken into account when studying the van der Waals interaction. We investigate the influence of such a solvent on the dispersion force for a quasi one-dimensional model cases of two plates of finite thickness and infinite lateral extension on the one hand and two atoms on the other. We model the real cavity by a realistic density profile of the solvent near the interacting objects and compare our results with those obtained from a simpler hard-cavity model with step-function profile.
[1] S.Y. Buhmann, Dispersion forces I, Springer (Heidelberg, Berlin) 2012. [2] S. K. Lamoreaux, Phys. Rev. Lett. 78, 5 (1997). [3] A. Held, M. Walter, J. Chem. Phys. 141, 174108 (2014).