Luttinger-liquid behavior in weakly disordered quantum wires.
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 with 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.
Levy
E
E
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel. eyallevy@post.tau.ac.il
Tsukernik
A
A
Karpovski
M
M
Palevski
A
A
Dwir
B
B
Pelucchi
E
E
Rudra
A
A
Kapon
E
E
Oreg
Y
Y