Spontaneous spin polarization in quantum wires
Abstract
A number of recent experiments report spin polarization in quantum wires in the absence of magnetic fields. These observations are in apparent contradiction with the Lieb-Mattis theorem, which forbids spontaneous spin polarization in one dimension. We show that sufficiently strong interactions between electrons induce deviations from the strictly one-dimensional geometry and indeed give rise to a ferromagnetic ground state in a certain range of electron densities.
- Publication:
-
EPL (Europhysics Letters)
- Pub Date:
- May 2006
- DOI:
- 10.1209/epl/i2006-10024-x
- arXiv:
- arXiv:cond-mat/0507387
- Bibcode:
- 2006EL.....74..679K
- Keywords:
-
- 73.21.Hb;
- 75.10.Pq;
- Quantum wires;
- Spin chain models;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 4 pages, 4 figures