Localization in an incommensurate potential: exactly solvable multidimensional model
Pastur L. A., Figotin A. L.
The one-dimensional model proposed by Grempel, Fishman, and Prange is extended to the multidimensional case. The energy levels and the states which are localized at all energies are found for a broad range of parameters. The conductivity is exponentially small at low frequencies. Localization does not occur if the situation is slightly incommensurate.