Possible Spin Polarization in a One-Dimensional Electron Gas
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 0.7\(2e2/h\). In an in-plane magnetic field all the 1D subbands show linear Zeeman splitting, and in the wide channel limit the g factor is |g| = 0.4, close to that of bulk GaAs. For the last subband, spin splitting originates from the structure at 0.7\(2e2/h\), indicating spin polarization at B = 0. The measured enhancement of the g factor as the subbands are depopulated suggests that the ``0.7 structure'' is induced by electron-electron interactions.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 1996
- DOI:
- 10.1103/PhysRevLett.77.135
- arXiv:
- arXiv:cond-mat/9606004
- Bibcode:
- 1996PhRvL..77..135T
- Keywords:
-
- Condensed Matter
- E-Print:
- Ten pages with four ps figures. Accepted for publication in Phys. Rev. Lett. (17. June 1996)