Metastable electron-pair states in a two-dimensional crystal

@article{Hai2013MetastableES,
  title={Metastable electron-pair states in a two-dimensional crystal},
  author={G.-Q. Hai and Leonardo K. Castelano},
  journal={Journal of Physics: Condensed Matter},
  year={2013},
  volume={26}
}
We study possible quantum states of two correlated electrons in a two-dimensional periodic potential and find a metastable energy band of electron pairs between the two lowest single-electron bands. These metastable states result from interplay of the electron–electron Coulomb interaction and the strength of the crystal potential. The paired electrons are bound in the same unit cell in relative coordinates with an average distance between them of approximately one third of the crystal period… 
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