Luttinger-Liquid Behavior in Weakly Disordered Quantum Wires
Abstract
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≅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.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2006
- DOI:
- 10.1103/PhysRevLett.97.196802
- arXiv:
- arXiv:cond-mat/0509027
- Bibcode:
- 2006PhRvL..97s6802L
- Keywords:
-
- 73.21.Hb;
- 71.10.Pm;
- 73.23.Ad;
- Quantum wires;
- Fermions in reduced dimensions;
- Ballistic transport;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 4 pages, 4 figures