Phason modes in spin-density wave in the presence of long-range Coulomb interaction

Details Phason modes in spin-density wave in the presence of long-range Coulomb interaction Phason modes in spin-density wave in the presence of long-range Coulomb interaction

1993-11-24

arxiv.org/abs/cond-mat/9311056v1

Physics

Condensed Matter

7 pages, Revtex 2.1, SZFKI 102/93

Scientific paper

10.1103/PhysRevB.49.6074

We study the effect of long-range Coulomb interaction on the phason in spin-density wave (SDW) within mean field theory. In the longitudinal limit and in the absence of SDW pinning the phason is completely absorbed by the plasmon due to the Anderson-Higgs mechanism. In the presence of SDW pinning or when the wave vector {\bf q} is tilted from the chain direction, though the plasmon still almost exhausts the optical sum rule, another optical mode appears at $\omega < 2\Delta(T)$, with small optical weight. This low frequency mode below the SDW gap may be accessible to electron energy loss spectroscopy (EELS).

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