284 citations · 766 across the 32 of their papers we have counts for
5 papers · 2 filters
Half-magnetization plateau stabilized by structural distortion in the antiferromagnetic Heisenberg model on a pyrochlore lattice
K. Penc, N. Shannon, H. Shiba
Magnetization plateaus, visible as anomalies in magnetic susceptibility at low temperatures, are one of the hallmarks of frustrated magnetism. We show how an extremely robust half-…
One-Electron Singular Branch Lines of the Hubbard Chain
J. M. P. Carmelo, K. Penc, L. M. Martelo +5
The momentum and energy dependence of the weight distribution in the vicinity of the one-electron spectral-function singular branch lines of the 1D Hubbard model is studied for all…
Cyclic exchange, isolated states and spinon deconfinement in an XXZ Heisenberg model on the checkerboard lattice
Nic Shannon, Gregoire Misguich, Karlo Penc
The antiferromagnetic Ising model on a checkerboard lattice has an ice-like ground state manifold with extensive degeneracy. and, to leading order in J_xy, deconfined spinon excita…
Orbital degeneracy as a source of frustration in LiNiO
F. Vernay, K. Penc, P. Fazekas +1
Motivated by the absence of cooperative Jahn-Teller effect and of magnetic ordering in LiNiO, a layered oxide with triangular planes, we study a general spin-orbital model on t…
Superconductivity Driven by Chain Coupling and Electronic Correlations
J. M. P. Carmelo, F. Guinea, K. Penc +1
We present an analysis of a system of weakly coupled Hubbard chains based on combining an exact study of spectral functions of the uncoupled chain system with a renormalization gro…