Mn induced modifications of Ga 3d photoemission from (Ga, Mn)As: evidence for long range effects

TL;DR

This study uses synchrotron photoemission to reveal that Mn atoms in (Ga, Mn)As influence Ga 3d core levels over long distances, indicating extended electronic effects beyond immediate neighbors.

Contribution

It provides evidence for long-range electronic modifications induced by Mn in (Ga, Mn)As, with each Mn atom affecting Ga core levels within a 1.4 nm sphere.

Findings

Mn affects Ga 3d spectra despite being substitutional

Each Mn influences a volume of about 1.4 nm diameter

Long-range effects are significant even at low Mn concentrations

Abstract

Using synchrotron based photoemission, we have investigated the Mn-induced changes in Ga 3d core level spectra from as-grown ${\rm Ga}_{1-x}{\rm Mn}_{x}{\rm As}$. Although Mn is located in Ga substitutional sites, and does therefore not have any Ga nearest neighbours, the impact of Mn on the Ga core level spectra is pronounced even at Mn concentrations in the range of 0.5%. The analysis shows that each Mn atom affects a volume corresponding to a sphere with around 1.4 nm diameter.