Reduced dielectric response in spatially varying electric fields

J. S. Hansen
2015 Journal of Chemical Physics  
In this paper, the dynamical equation for polarization is derived. From this the dielectric response to a spatially varying electric field is analyzed showing a reduced response due to flux of polarization in the material. This flux is modeled as a diffusive process through linear constitutive relations between the flux and the gradient of the polarization. Comparison between the theory and molecular dynamics simulations confirms this effect. The effect is significant for small length scale
more » ... tric field variations and the inclusion of the flux is thus important in nanoscale modeling of dielectric response. C 2015 AIP Publishing LLC. [http://dx.
doi:10.1063/1.4935825 pmid:26590542 fatcat:2gl5jwxaqzbipo4a43kz43j7pi