Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 47: Quantum Effects (QED) II
Q 47.2: Vortrag
Donnerstag, 14. März 2019, 10:45–11:00, S Gr. HS Maschb.
Dispersion forces in inhomogeneous stratified media — •Johannes Fiedler1,2, Clas Persson2, and Stefan Yoshi Buhmann1,3 — 1Institute of Physics, University of Freiburg, Germany — 2Centre for Materials Science and Nanotechnology, University of Oslo, Norway — 3Freiburg Institute for Advanced Studies (FRIAS), Germany
Dispersion forces, such as van der Waals and Casimir forces are caused by ground-state fluctuations of the electromagnetic field and typically result in an attraction of the considered objects [1]. When describing these interactions with the methods of mQED, they are due to exchange of virtual photons [2]. An environment, as considered for instance in the context of possible repulsive forces, changes their scattering processes. Microscopic simulations of a particle embedded in a liquid shows a spatial distribution of the dielectric function [3].
We present an effectively one-dimensional model for dispersion forces in liquids taking into account such inhomogeneous dielectric profiles. The reflection coefficient will be approximated by analytical functions. This solution describes the impact of a local-field correction in analogy to cavity models. We illustrate the impact of the found model on the van der Waals and Casimir forces between two helium atoms and a two helium nano sheets embedded in water [4].
[1] H. B. G. Casimir, Proc. Kon. Nederland. Akad. Wetensch. B 51, 793 (1948). [2] S. Y. Buhmann Dispersion forces I, Springer (Heidelberg) 2012. [3] A. Held & M. Walter, J. Chem. Phys. 141, 174108 (2014). [4] J. Fiedler et al., submitted to PRA.