Spurious localized highest-frequency modes in Schr\"odinger-type   equations solved by finite-difference methods
  High-frequency solutions of one or several Schr\"odinger-type equations are well known to differ very little from the plane wave solutions $\exp[\pm ik x]$. That is, the potential terms impact the envelope of a high-frequency plane wave by only a small amount. However, when such equations are solved by a finite-difference method, the highest-frequency solutions may, under certain conditions, turn out to be localized. In this letter we explain this numerical artifact. 
Taras I. Lakoba
math-ph math.MP nlin.PS