ASYMMETRIC I V CHARACTERISTICS IN NONALTERNANT CARBON NETWORKS/

Carbon rings containing an odd number of atoms have a nonalternant cha racter which causes an intrinsic charge separation. This is due to an asymmetry between electron and hole states in the local density of sta tes. This feature is analyzed in detail for the case of the azulene mo lecule. We show that nonalternant character leads to an asymmetry in t he I/V characteristic of such molecules, as well as to different elect ron and hole transport. regimes.