207 citations · 453 across the 9 of their papers we have counts for
4 papers · 1 filter
Pairing Symmetries of a Hole-Doped Extended Two-Orbital Model for the Pnictides
Andrew Nicholson, Weihao Ge, José Riera +3
The hole-doped ground state of a recently introduced extended "t-U-J" two-orbital Hubbard model for the Fe-based superconductors is studied via exact diagonalization methods on sma…
Study of the magnetic state of KFeSe using the five-orbital Hubbard model in the Hartree-Fock approximation
Qinlong Luo, Andrew Nicholson, José Riera +3
Motivated by the recent discovery of Fe-based superconductors close to an antiferromagnetic insulator in the experimental phase diagram, here the five-orbital Hubbard model (withou…
Role of Degeneracy, Hybridization, and Nesting in the Properties of Multi-Orbital Systems
Andrew Nicholson, Qinlong Luo, Weihao Ge +5
To understand the role that degeneracy, hybridization, and nesting play in the magnetic and pairing properties of multiorbital Hubbard models we here study numerically two types of…
Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictides
Andrew Nicholson, Weihao Ge, Xiaotian Zhang +6
We introduce and study an extended "t-U-J" two-orbital model for the pnictides that includes Heisenberg terms deduced from the strong coupling expansion. Including these J terms ex…