Volume 74, Number 4, May 2006
|Page(s)||679 - 685|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||12 April 2006|
Spontaneous spin polarization in quantum wires
Materials Science Division, Argonne National Laboratory - Argonne, IL 60439, USA
Accepted: 23 March 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.
PACS: 73.21.Hb – Quantum wires / 75.10.Pq – Spin chain models
© EDP Sciences, 2006
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