Renormalization group study of interacting electrons

Details Renormalization group study of interacting electrons Renormalization group study of interacting electrons

1995-05-26

arxiv.org/abs/cond-mat/9505140v1

Phys. Rev. B52 (1995) 13487.

Physics

Condensed Matter

11 pages, RevTeX 3.0, 2 PostScript figures

Scientific paper

10.1103/PhysRevB.52.13487

The renormalization-group (RG) approach proposed earlier by Shankar for interacting spinless fermions at $T=0$ is extended to the case of non-zero temperature and spin. We study a model with $SU(N)$-invariant short-range effective interaction and rotationally invariant Fermi surface in two and three dimensions. We show that the Landau interaction function of the Fermi liquid, constructed from the bare parameters of the low-energy effective action, is RG invariant. On the other hand, the physical forward scattering vertex is found as a stable fixed point of the RG flow. We demonstrate that in $d=2$ and 3, the RG approach to this model is equivalent to Landau's mean-field treatment of the Fermi liquid. We discuss subtleties associated with the symmetry properties of the scattering amplitude, the Landau function and the low-energy effective action. Applying the RG to response functions, we find the compressibility and the spin susceptibility as fixed points.

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