paper

Non-perturbative approach to Luttinger's theorem in one dimension

arXiv:cond-mat/9701141 · doi:10.1103/PhysRevLett.79.1110

Abstract

The Lieb-Schultz-Mattis theorem for spin chains is generalized to a wide range of models of interacting electrons and localized spins in one-dimensional lattice. The existence of a low-energy state is generally proved except for special commensurate fillings where a gap may occur. Moreover, the crystal momentum of the constructed low-energy state is , where is the Fermi momentum of the non-interacting model, corresponding to Luttinger's theorem. For the Kondo lattice model, our result implies that must be calculated by regarding the localized spins as additional electrons.

Note added on the rigorous proof given by H. Tasaki; also added some references; 5 pages, REVTEX (no figure)

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