
%0 Journal Article
%A Reilly, D. J. 
%A Pfeiffer, L. N. 
%A Facer, G. R. 
%A West, K. W. 
%A Dzurak, A. S. 
%A Kane, B. E. 
%A Clarke, R. G. 
%A Stiles, P. J. 
%A O'Brien, J. L. 
%A Lumpkin, N. E. 
%T Many-body Spin Interactions in Semiconductor Quantum Wires
%J Australian Journal of Physics
%D 2001/02/23
%V 53
%N 4
%P 543-552
%K 
%R https://doi.org/10.1071/PH00040
%U https://www.publish.csiro.au/paper/PH00040 
%X Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 × 2e 2 /h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra-low-disorder GaAs/AlGaAs quantum wires with nominal lengths l=0 and 2µm, fabricated from structures free of the disorder associated with modulation doping. In a direct comparision we observe structure near 0.7 × 2e 2 /h for l = 0, whereas thel = 2µm wires show structure evolving with increasing electron density to 0.5 × 2e 2 /h in zero magnetic field, the value expected for an ideal spin-split sub-band. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the 1D region. 
