Temperature dependent spin susceptibility in a two-dimensional metal

Details Temperature dependent spin susceptibility in a two-dimensional metal Temperature dependent spin susceptibility in a two-dimensional metal

2005-01-07

arxiv.org/abs/cond-mat/0501132v1

Rapid Communications in Phys. Rev. B 71, 201302 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, no figures

Scientific paper

10.1103/PhysRevB.71.201302

We consider a two-dimensional electron system with Coulomb interaction between particles at a finite temperature T. We show that the dynamic Kohn anomaly in the response function at 2K_F leads to a linear-in-T correction to the spin susceptibility, same as in systems with short-range interaction. We show that the singularity of the Coulomb interaction at q=0 does not invalidate the expansion in powers of r_s, but makes the expansion non-analytic. We argue that the linear temperature dependence is consistent with the general structure of Landau theory and can be viewed as originating from the non-analytic component of the Landau function near the Fermi surface.

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