  In this paper we study the persistent current (PC) of a staggered Harper
model, close to the half-filling. The Harper model, which is a quasi-periodic
system, is different than other one dimensional systems with uncorrelated
disorder in the fact that it can be in the metallic regime. Nevertheless, the
PC for a wide range of parameters of the Harper model does not show typical
metallic behavior, although the system is in the metallic regime. This is a
result of the nature of the central band states, which are a hybridization of
Gaussian states localized in superlattice points. When the superlattice is not
commensurate with the system length, the PC behaves as in an insulator. Thus
even in the metallic regime a typical finite Harper model may exhibit a PC
expected from an insulator.
