In particular , the low - density Wannier equation is analogous to bound solutions of the hydrogen problem of quantum mechanics .
This homogeneous part yields an eigenvalue problem that can be expressed through the generalized Wannier equation that can be solved analytically in special cases .
The low - density Wannier equation is analogous to bound solutions of the hydrogen problem of quantum mechanics .
This homogeneous part yields an eigenvalue problem that can be expressed through the generalized Wannier equation that can be solved analytically in special cases .