Ab initio study of surface stress response to charging

Details Ab initio study of surface stress response to charging Ab initio study of surface stress response to charging

2007-02-19

arxiv.org/abs/cond-mat/0702441v1

Physics

Condensed Matter

Materials Science

epl-style, 7 pages, 1 figure, to appear in Europhysics Letters

Scientific paper

We explore an efficient way to numerically evaluate the response of the surface stress of a metal to changes in its superficial charge density by analysis of the strain-dependence of the work function of the uncharged surface. As an application we consider Au(111), (110) and (100) surfaces, employing density functional calculations. The sign of the calculated response parameter can be rationalized with the dependence of the surface dipole and the Fermi energy on strain. The numerical value falls within the range indicated by experiment. The magnitude can explain the experimentally observed volume changes of nanoporous materials upon charging.

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