Spontaneous polarisation of the neutral interface for valence asymmetric coulombic systems

TL;DR

This paper investigates the spontaneous polarization at neutral interfaces in valence asymmetric Coulomb systems, revealing a quantum-mechanically rooted phenomenon with theoretical and numerical agreement.

Contribution

It introduces a field theoretical model explaining spontaneous polarization in valence asymmetric Coulomb systems, linking quantum properties to charge density profiles.

Findings

Good agreement between theory and numerical simulations

Spontaneous polarization linked to valence asymmetry and quantum effects

Charge density profiles exhibit non-trivial features

Abstract

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.