Spin Singlet Ordering Suggested by Repulsive Interactions
Abstract
We consider a correlated wavefunction including particle-hole pairing at half a reciprocal lattice vector for itinerant electrons hopping on a square lattice in two dimensions and subject both to on-site and nearest-neighbor repulsion. We find, within mean field theory, that in a suitable range of parameters there is a tendency toward a novel form of ordering characterized by discrete symmetry breaking and a gap at the magnetic zone boundary, which supports hole-like semiconductor behavior near half filling despite an apparently normal Fermi surface. The effective quasiparticle couplings to phonons includes a significant d-wave piece, which plausibly leads to an especially robust tendency toward superconductivity.
Cite
@article{arxiv.cond-mat/9510132,
title = {Spin Singlet Ordering Suggested by Repulsive Interactions},
author = {Chetan Nayak and Frank Wilczek},
journal= {arXiv preprint arXiv:cond-mat/9510132},
year = {2007}
}
Comments
12 pages, no figures, Phyzzx