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Numerical evidence for thermally induced monopoles

Autor(en)
Peter Wirnsberger, Domagoj Fijan, Roger A. Lightwood, Andela Šarić, Christoph Dellago, Daan Frenkel
Abstrakt

Electric charges are conserved. The same would be expected to hold for magnetic charges, yet magnetic monopoles have never been observed. It is therefore surprising that the laws of nonequilibrium thermodynamics, combined with Maxwell's equations, suggest that colloidal particles heated or cooled in certain polar or paramagnetic solvents may behave as if they carry an electric/magnetic charge. Here, we present numerical simulations that show that the field distribution around a pair of such heated/cooled colloidal particles agrees quantitatively with the theoretical predictions for a pair of oppositely charged electric or magnetic monopoles. However, in other respects, the nonequilibrium colloidal particles do not behave as monopoles: They cannot be moved by a homogeneous applied field. The numerical evidence for the monopole-like fields around heated/cooled colloidal particles is crucial because the experimental and numerical determination of forces between such colloidal particles would be complicated by the presence of other effects, such as thermophoresis.

Organisation(en)
Computergestützte Physik und Physik der Weichen Materie
Externe Organisation(en)
University of Cambridge, Oxford Brookes University, Université catholique de Louvain
Journal
Proceedings of the National Academy of Sciences of the United States of America (PNAS)
Band
114
Seiten
4911-4914
Anzahl der Seiten
4
ISSN
0027-8424
DOI
https://doi.org/10.1073/pnas.1621494114
Publikationsdatum
05-2017
Peer-reviewed
Ja
ÖFOS 2012
103015 Kondensierte Materie, 103029 Statistische Physik
Schlagwörter
ASJC Scopus Sachgebiete
General
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/277d3ac1-4174-4f67-9dd3-c2316984bb07