Lattice models for non-Fermi liquid metals

Details Lattice models for non-Fermi liquid metals Lattice models for non-Fermi liquid metals

2008-09-04

arxiv.org/abs/0809.0762v2

Phys. Rev. B 78, 245111 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.78.245111

We present two 2D lattice models with non-Fermi liquid metallic phases. We show that the low energy physics of these models is exactly described by a Fermi sea of fractionalized quasiparticles coupled to a fluctuating U(1) gauge field. In the first model, the underlying degrees of freedom are spin 1/2 fermions. This model demonstrates that electrons can in principle give rise to non-Fermi liquid metallic phases. In the second model, the underlying degrees of freedom are spinless bosons. This model provides a concrete example of a (non-Fermi liquid) Bose metal. With little modification, it also gives an example of a critical U(1) symmetric spin liquid.

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