Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Correlated Electrons: Other Materials
TT 31.8: Vortrag
Dienstag, 21. März 2017, 15:45–16:00, HSZ 103
Casimir forces between two impurities in a lattice — •Andrei Pavlov1, Dmitri Efremov1, and Jeroen van den Brink1,2 — 1Institute for Theoretical Solid State Physics, IFW Dresden, 01069 Dresden, Germany — 2Institute for Theoretical Physics, TU Dresden, 01069 Dresden, Germany
One of the fundamental properties of matter is the Casimir force, i.e. interaction of classical objects via quantum fluctuations. It appears in various field, including optics, Bose-condensates, micro-structure geometry compounds, etc. The usual wisdom is that the Casimir force between two atoms decays as r−(2D+1), which is originated from the two boson exchange in the lowest order of the perturbation theory. Stimulated by the recent experiments on the high temperature superconductor H3S under high pressure, we reconsider the Casimir forces between two impurities in solid state physics via virtual phonons at long and short distances. We found strong deviation from the standard law at short distances which depends on the masses of impurities atoms. At long distances it comes to the standard r-dependence, but the value of the prefactor is much larger than it’s expected from the lowest orders of the perturbation theory. These differences become important when the impurity masses differ from the lattice atoms more than twice. Finally we apply our results to impurity atoms of deuterium and tritium in H3S.