Abstract
In zero magnetic field, conductance measurements of clean one-dimensional (1D) constrictions defined in GaAs/AlGaAs heterostructures show up to 26 quantized ballistic plateaus, as well as a structure close to . In an in-plane magnetic field all the 1D subbands show linear Zeeman splitting, and in the wide channel limit the factor is , close to that of bulk GaAs. For the last subband, spin splitting originates from the structure at , indicating spin polarization at . The measured enhancement of the factor as the subbands are depopulated suggests that the “0.7 structure” is induced by electron-electron interactions.
- Received 4 March 1996
DOI:https://doi.org/10.1103/PhysRevLett.77.135
©1996 American Physical Society