PERSISTENT CURRENT IN A 2-BAND DISORDERED INTERACTING ONE-DIMENSIONALRING

Using numerical exact diagonalization and analytical variational calcu lations, we examine the effect of an electronic two-band structure on the persistent current of an interacting disordered one-dimensional ri ng. Several different features in comparison to a single band model ar e encountered. Among them are a transition in the magnitude of current for a critical ratio of the hopping elements in the two bands, and a large increase in the rms value of the persistent current for certain values of interaction and disorder. Possible experimental implications are discussed.