Spontaneous spin polarization in quantum wiresA. D. Klironomos, J. S. Meyer and K. A. Matveev
Materials Science Division, Argonne National Laboratory - Argonne, IL 60439, USA
received 18 January 2006; accepted in final form 23 March 2006
published online 12 April 2006
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.
73.21.Hb - Quantum wires.
75.10.Pq - Spin chain models.
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