\[\mathbf{A}(z,\lambda)=-i(4\lambda^{2}+2w^{2}+z)\begin{bmatrix}1&0\\
0&-1\end{bmatrix}-2w^{\prime}\begin{bmatrix}0&-i\\
i&0\end{bmatrix}+\left(4\lambda w-\frac{\alpha}{\lambda}\right)\begin{bmatrix}%
0&1\\
1&0\end{bmatrix},\]