Experimental evidence for resonant tunneling in a Luttinger liquid

We have measured the low-temperature conductance of a one-dimensional islan d embedded in a single mode quantum wire. The quantum wire is fabricated us ing the cleaved edge overgrowth technique and the tunneling is through a si ngle state of the island. Our results show that while the resonance line sh ape: fits the derivative of the Fermi function the intrinsic linewidth decr eases in a power law fashion as the temperature is reduced. This behavior a grees quantitatively with Furusaki's model for resonant tunneling in a Lutt inger liquid.