Spatial structure and magnetism of a spin-orbit entangled spin-1 coherent spin center: the manganese neutral acceptor in a III-V semiconductor

TL;DR

This paper investigates the complex spin and magnetic properties of a manganese dopant in a III-V semiconductor, revealing entangled states and magnetic fringe fields that could be detected by advanced magnetometry.

Contribution

It provides an analytic ground-state wavefunction for the Mn dopant, uncovering novel spin-charge correlations beyond semiclassical models.

Findings

Large magnetic fringe fields (~1 μT at 10 nm) around Mn in GaAs.

Surprising spin-charge correlations in the ground state.

Potential detection of magnetic fields via NV-diamond magnetometry.

Abstract

A Mn dopant in a III-V semiconductor produces a highly-entangled, coherent triplet ground state not fully captured by single-determinant theories of electron structure. We directly construct an analytic form for its ground-state wavefunction, finding surprising spin-charge correlations not revealed by semiclassical calculations. Spin-correlated circulating currents associated with the dopant yield remarkably large magnetic fringe fields of $\sim$1$\,\mu$T at distances of $\sim 10$~nm from Mn in GaAs, potentially detectable by NV-diamond magnetometry while the dopant spin coherently precesses.