Spin Texture

Current status: PARTIAL

This partial Spin Texture workflow is based on exact Quantum ESPRESSO spin expectation outputs.

The physical quantity is

$$S_i(n,\mathbf k) = \frac{\hbar}{2} \langle \psi_{n\mathbf k} | \sigma_i | \psi_{n\mathbf k} \rangle, \qquad i=x,y,z.$$

Analyze should allow inspection of $S_x$, $S_y$, $S_z$, and optionally $|S|$ along the sampled band path or mesh.

These values must come from the engine's spin-operator expectations, not from PDOS differences.