Spontaneous polarisation of the neutral interface for valence asymmetric coulombic systems

Details Spontaneous polarisation of the neutral interface for valence asymmetric coulombic systems Spontaneous polarisation of the neutral interface for valence asymmetric coulombic systems

2008-09-30

arxiv.org/abs/0809.5214v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 11 figures

Scientific paper

In this paper, we discuss the phenomenon of a spontaneous polarisation of a neutral hard planar interface for valence asymmetric coulombic systems. Within a field theoretical description, we account for the existence of non trivial charge density and electric potential profiles. The analysis of the phenomenon shows that the effect is related to combinatorics in relation with the existence of the two independent species cations and anions. This simple and basic feature is related to the quantum mechanical properties of the system. The theoretical results are compared with numerical simulations data and are shown to be in very good agreement, which a fortiori justifies our physical interpretation.

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