Role of interchain hopping in two disordered chains of spinless fermions

The effect of interchain hopping on localization has been investigated for two coupled chains of spinless fermions with nearest neighbor interaction. By use of the renormalization group method, it is found that interchain hop ping plays a significant role when the correlation gap induced by interplay of interchain hopping and intrachain interaction becomes larger than the A nderson localization energy scale induced by impurities. The strong competi tion between localization and delocalization is examined for attractive int eraction.