2002/09/30 by T. Senthil, Subir Sachdev, Matthias Vojta · 5 citations
Physics and Astronomy · #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.90.216403
published as Physical Review Letters 90, 216403 (2003) · 4 pages, 1 figure; (v2) changed title and terminology, but content largely unchanged; (v3) updated version to appear in PRL
arxiv created 2003/05/07 · arxiv updated 2009/11/30
In spatial dimensions d >= 2, Kondo lattice models of conduction and local moment electrons can exhibit a fractionalized, non-magnetic state (FL*) with a Fermi surface of sharp electron-like quasiparticles, enclosing a volume quantized by (ρa-1)(mod 2), with ρa the mean number of all electrons per unit cell of the ground state. Such states have fractionalized excitations linked to the deconfined phase of a gauge theory. Confinement leads to a conventional Fermi liquid state, with a Fermi volume quantized by ρa (mod 2), and an intermediate superconducting state for the Z2 gauge case. The FL* state permits a second order metamagnetic transition in an applied magnetic field.