NV-Center Vector Magnetometry — 2D Pole-Figure Reconstruction

Nitrogen-vacancy defects in diamond sit along four distinct crystallographic axes, and each one reports the Zeeman splitting of only its own projection of the magnetic field. This 2D companion runs the identical least-squares reconstruction as the 3D version, but plots it as a stereographic pole figure — the flat-paper projection used in real crystallography — alongside a measured-vs-predicted residual scatter that makes the quality of the over-determined fit directly visible.