Hidden spin-current conservation in 2d Fermi liquids

Details Hidden spin-current conservation in 2d Fermi liquids Hidden spin-current conservation in 2d Fermi liquids

1998-09-27

arxiv.org/abs/cond-mat/9809364v2

Physics

Condensed Matter

4 pages, no figures, revised version, accepted for pub. in the PRL

Scientific paper

10.1103/PhysRevLett.82.3851

We report the existence of regimes of the two dimensional Fermi liquid that show unusual conservation of the spin current and may be tuned by varying some parameter like the density of fermions. We show that for reasonable models of the effective interaction the spin current may be conserved in general in 2d, not only for a particular regime. Low temperature spin waves propagate distinctively in these regimes and entirely new ``spin-acoustic'' modes are predicted for scattering-dominated temperature ranges. These new high-temperature propagating spin waves provide a clear signature for the experimental search of such regimes.

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