0.7 structure in long quantum wires

Abstract

While quantized conductance steps in short quantum wires are understood through a single electron picture, additional structure often observed in high-quality one-dimensional systems near g=0.7×(2 e 2/ h) is commonly interpreted as arising due to many-body interactions. Most studies of conductance structure below 2 e 2/ h use short one-dimensional wires where transport is known to be ballistic. We report transport measurements for both short (0.5 μm) and long (5 μm) quantum wires, and use both conductance and nonlinear transport to explore the behavior of one-dimensional wires.