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Levy, E. and Tsukernik, A. and Karpovski, M. and Palevski, A. and Dwir, B. and Pelucchi, E. and Rudra, A. and Kapon, E. and Oreg, Y.
2006
Physical Review Letters
Luttinger-liquid behavior in weakly disordered quantum wires
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We have measured the temperature dependence of the conductance in long V-groove quantum wires fabricated in GaAs/AlGaAs heterostructures. Our data are consistent with recent theories developed within the framework of the Luttinger-liquid model, in the limit of weakly disordered wires. We show that, for the relatively low level of disorder in our quantum wires, the value of the interaction parameter g congruent to 0.66, which is the expected value for GaAs. However, samples with a higher level of disorder show conductance with stronger temperature dependence, which does not allow their treatment in the framework of perturbation theory. Fitting such data with perturbation-theory models leads inevitably to wrong (lower) values of g.
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