School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
Ecole Polytechnique Federale de Lausanne (EPFL)CH-1015 Lausanne, Switzerland
Dept. of Condensed Matter PhysicsThe Weizmann Institute of Science, Rehovot 76100, Israel
The electrical conductance through noninteracting clean quantum wires containing a number of one-dimensional subbands is quantized in the universal units 2e2/h.1,2 As the number of the subbands is changed, the conductance varies in a step-like manner (with the plateaus at integer values of the universal unit), as was observed in narrow constrictions in 2D electron gas (2DEG) system.3,4 Typically, the size of the constrictions is comparable to the Fermi length λF, and is much shorter than the mean free path in the 2DEG. For such short and clean narrow wires, the electron-electron interactions described by the so-called Luttinger liquid (LL) model5 do not affect the value of the conductance, namely it is temperature and length independent, as indeed was shown experimentally.3,4 In the presence of disorder suppression of the conductance is expected at low temperatures in sufficiently long quantum wires (QWRs) containing at least a few electrons. A number of theoretical papers6-9 predicted a negative correction to the conductance temperature dependence G(T), which obeys a Tg-1 power law, ...