Abstract
Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra low-disorder quantum wires with nominal lengths 0.5, and 2 fabricated from structures free of the disorder associated with modulation doping. In a direct comparison in zero magnetic field we observe structure near for whereas the wires show structure evolving with increasing electron density to the value expected for an ideal spin-split subband. For intermediate lengths the feature at evolves to with increasing density. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the one-dimensional region.
- Received 21 November 2000
DOI:https://doi.org/10.1103/PhysRevB.63.121311
©2001 American Physical Society