A Rellich Type Theorem for Discrete Schr{\"o}dinger Operators
  An analogue of Rellich's theorem is proved for discrete Laplacian on square lattice, and applied to show unique continuation property on certain domains as well as non-existence of embedded eigenvalues for discrete Schr{\"o}dinger operators. 
Hiroshi Isozaki and Hisashi Morioka
math.SP