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