Abstract
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 hopping plays a significant role when the correlation gap induced by interplay of interchain hopping and intrachain interaction becomes larger than the Anderson localization energy scale induced by impurities. The strong competition between localization and delocalization is examined for attractive interaction.
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