4 papers
From nodal liquid to nodal Mottness in a frustrated Hubbard model
J. Hopkinson, K. Le Hur
We investigate the physics of frustrated 3-leg Hubbard ladders in the band limit, when hopping across the ladder's rungs (t) is of the same order as hopping along them (t…
LiVO: frustration induced heavy fermion metal
J. Hopkinson, P. Coleman
We propose a two-stage spin quenching scenario for the unusual heavy fermion state realized in the mixed valent metal LiVO. In this theory, local valence fluctuations are r…
LiV2O4: evidence for two-stage screening
J. Hopkinson, P. Coleman
LiV2O4, a frustrated mixed valent metal (d^1 <-> d^2), is argued to undergo two spin-screening processes. The first quenches the effective spin to produce the spin 1/2 behavior see…
Supersymmetric Hubbard Operators
P. Coleman, C. Pepin, J. Hopkinson
We develop a supersymmetric representation of the Hubbard operator which unifies the slave boson and slave fermion representations into a single gauge theor…