# Density-functional theory study of ionic inhomogeneity in metal clusters using SC-ISJM

## TL;DR

This study applies a self-consistent inhomogeneous jellium model to predict electronic and geometric properties of various metal clusters, validating results with first-principles calculations and capturing size and structural changes.

## Contribution

The paper introduces a generalized inhomogeneous stabilized jellium model with two regions, improving predictions of cluster size and inter-layer distances compared to previous models.

## Key findings

- Model accurately predicts size reductions in clusters.
- Model captures size increases in some clusters.
- Results agree well with first-principles calculations.

## Abstract

In this work we have applied the recently formulated self-compressed inhomogeneous stabilized jellium model [M. Payami and T. Mahmoodi, Can. J. Phys. {\bf 89}, 967 (2011)] to describe the equilibrium electronic and geometric properties of atomic-closed-shell simple metal clusters of Al$_N$ ($N$=13, 19, 43, 55, 79, 87, 135, 141), Na$_N$, and Cs$_N$ ($N$=9, 15, 27, 51, 59, 65, 89, 113). To validate the results, we have also performed first-principles pseudo-potential calculations and used them as our reference. In the model, we have considered two regions consisting of "surface" and "inner" ones, the border separating them is sharp. This generalization makes possible to decouple the relaxations of different parts of the system. The results show that the present model correctly predicts the size reductions seen in most of the clusters. It also predicts increase in size of some clusters, as observed from first-principles results. The other property is the change of inter-layer distances, which in most cases were realized as contractions and in a few cases as expansions, are reproduced in good agreement with the atomic simulation results. For a better description of the properties, it is possible to improve the method of choosing the thicknesses or generalize the model to include more regions than just two.