FIG. 3.

The spin expectation values ($⟨\overrightarrow{S}⟩$) for spin-adiabats 4–7 at the crossing point in Fig. 2 for two field strengths (B_y = 0.5T and B_y = 5T) in the two-dimensional space created by the expectation values. At the crossing point, the spin vectors form collinear pairs that lie in plane with the direction of the magnetic field (shown in black). As the magnetic field strength is increased, the 4th and 7th spin-adiabats mix less with other states and the corresponding spin vectors align with the magnetic field.