Non-conservative forces in bulk systems

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Title: Non-conservative forces in bulk systems
Author(s): Todorov, TN
Cunningham, B
Dundas, D
Horsfield, AP
Item Type: Journal Article
Abstract: The ability of electrons and phonons in solids to equilibrate is fundamental to the thermodynamic and transport properties of these systems. Nonetheless in mesoscopic systems sufficiently high current densities can lead to situations where the phonon subsystem can no longer reach a steady state. In previous work this phenomenon was connected with the demonstration that interatomic forces under current are non- conservative, with the ability to do net work around closed paths in the nuclear subspace. Here we consider these effects in bulk systems. We arrive at a critical current density beyond which current flow results in the uncompensated stimulated emission of a blast of forward-travelling phonons. The resultant atomic motion is illustrated with model simulations of long atomic wires under current. While the critical current density for these effects is very high compared with those in electroplasticity phenomena, it is hoped that the paper will stimulate further research into non-conservative dynamics in extended conductors and the possible relevance of the effect to electropulsing.
Publication Date: 1-Jan-2017
Date of Acceptance: 10-Feb-2017
URI: http://hdl.handle.net/10044/1/44520
ISSN: 1316-2012
Publisher: Taylor & Francis
Journal / Book Title: Materials Science and Technology
Keywords: 0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Accepted
Appears in Collections:Faculty of Engineering
Materials
Faculty of Natural Sciences



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