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A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics
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Mabey, P., Richardson, S., White, T. G., Fletcher, L. B., Glenzer, S. H., Hartley, N. J., Vorberger, J., Gericke, Dirk O. and Gregori, G. (2017) A strong diffusive ion mode in dense ionized matter predicted by Langevin dynamics. Nature Communications, 8 . 14125 . doi:10.1038/ncomms14125 ISSN 2041-1723.
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Official URL: http://doi.org/10.1038/ncomms14125
Abstract
The state and evolution of planets, brown dwarfs and neutron star crusts is determined by the properties of dense and compressed matter. Due to the inherent difficulties in modelling strongly coupled plasmas, however, current predictions of transport coefficients differ by orders of magnitude. Collective modes are a prominent feature, whose spectra may serve as an important tool to validate theoretical predictions for dense matter. With recent advances in free electron laser technology, X-rays with small enough bandwidth have become available, allowing the investigation of the low-frequency ion modes in dense matter. Here, we present numerical predictions for these ion modes and demonstrate significant changes to their strength and dispersion if dissipative processes are included by Langevin dynamics. Notably, a strong diffusive mode around zero frequency arises, which is not present, or much weaker, in standard simulations. Our results have profound consequences in the interpretation of transport coefficients in dense plasmas.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Journal or Publication Title: | Nature Communications | ||||||
| Publisher: | Nature Publishing Group | ||||||
| ISSN: | 2041-1723 | ||||||
| Official Date: | 30 January 2017 | ||||||
| Dates: |
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| Volume: | 8 | ||||||
| Article Number: | 14125 | ||||||
| DOI: | 10.1038/ncomms14125 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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