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We studied the conductance renormalization and conductivity of multi-subbandTomonaga-Luttinger models with inter-subband interactions. We found that, as insingle-band systems, the conductance of a multi-subband system with anarbitrary number of subbands is not renormalized due to interaction betweenelectrons. We derived a formula for the conductivity in multi-subband models.We applied it to a simplified case and found that inter-subband interactionenhances the conductivity, which is contrary to the intra-subband repulsiveinteraction, and that the conductivity is further enhanced for a larger numberof subbands.Comment: 12 pages, no figures. to be published in Physical Review B as a brief  repor

Conductance renormalization and conductivity of a multisubband Tomonaga-Luttinger model