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In one dimension density-density interactions of particles reduce theirmobility and hence the Drude weight, which controls the divergence of theoptical conductivity at zero frequency, decreases. We study effects of pairhopping events on this result in a 1D system of spinless fermions. Theconsidered model consists of the usual single-particle hopping and pair hoppingterms. In the absence of the density-density interactions, we first show that avariation of the pair hopping amplitude results in a monotonic change of theDrude weight. We next demonstrate that weak nearest-neighbor density-densityinteractions increase the Drude weight, whereas in the regime of stronginteractions the Drude weight decreases as expected. Our numerical findings aresupported by bosonization results.

Enhanced Drude weight in a 1D system of fermions with pair hopping events