Effect of interchain frustration in quasi-one-dimensional conductors at half-filling

We examine the effect of frustrated interchain hoppings t(perpendicular to 1) and t(perpendicular to 2) on one- dimensional Mott insulators. By applying an N-perpendicular to- chain twoloop renormalization- group method to the half- filled quasi- one- dimensional Hubbard model, we show that the system remains insulating even for the large t(perpendicular to 1) as far as t(perpendicular to 2) = 0 and vice versa, whereas a metallic state emerges by increasing both interchain hoppings. We also discuss the metallic behaviour suggested in the quasi- one- dimensional organic compound ( TTM- TTP) I3 under high pressure.