Non-Fermi-liquid behavior in two dimensions due to long-ranged current-current interactions

DV Khveshchenko, R Hlubina, TM Rice - Physical Review B, 1993 - APS
Physical Review B, 1993APS
We examine the low-energy behavior of two-dimensional electrons with current-current
interactions. The interactions are long range, cannot be screened, and result in anomalies in
perturbation theory. In the Hartree-Fock theory, we find an instability of the Landau Fermi-
liquid state resulting in ''fermion-condensate''states with a high degeneracy of levels at the
Fermi energy. This degeneracy may be removed to give a Fermi-liquid state with vanishing
Fermi velocity. As an example, we investigate further the Fermi-liquid state with the …
Abstract
We examine the low-energy behavior of two-dimensional electrons with current-current interactions. The interactions are long range, cannot be screened, and result in anomalies in perturbation theory. In the Hartree-Fock theory, we find an instability of the Landau Fermi-liquid state resulting in ‘‘fermion-condensate’’states with a high degeneracy of levels at the Fermi energy. This degeneracy may be removed to give a Fermi-liquid state with vanishing Fermi velocity. As an example, we investigate further the Fermi-liquid state with the quasiparticle spectrum ε (p)∝(p-p F) 3/2 proposed by Halperin et al. Application of the recent Haldane scheme of bosonization in higher dimensions to this state leads to coupling between bosons, which has the form required for a breakdown of the Landau Fermi-liquid behavior. A generalized form of the Luttinger liquid is obtained.
American Physical Society
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