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With the envelope-function theory, the finite element method is developed to calculate the electronic structure of the Si Nanodisc. In the 1D quantum well superlattice, our FEM results well match with the classic Kronig-Penney method. However, the Kronig-Penney method can deal with the high-dimensional and complex geometry shape. Even if adopting the independent potential approximation, the Kronig-Penney...