207 citations · 2.5k across the 69 of their papers we have counts for
5 papers · 1 filter
Quantum Phase Diagram and Excitations for the One-Dimensional S=1 Heisenberg Antiferromagnet with Single-Ion Anisotropy
A. Fabricio Albuquerque, Chris J. Hamer, Jaan Oitmaa
We investigate the zero-temperature phase diagram of the one-dimensional S=1 Heisenberg antiferromagnet with single-ion anisotropy. By employing high-order series expansions and qu…
Pnictides as frustrated quantum antiferromagnet close to a quantum phase transition
Goetz S. Uhrig, Michael Holt, Jaan Oitmaa +2
We present a detailed description of the dynamics of the magnetic modes in the recently discovered superconducting pnictides using reliable self-consistent spin-wave theory and ser…
Discerning Incompressible and Compressible Phases of Cold Atoms in Optical Lattices
V. W. Scarola, L. Pollet, J. Oitmaa +1
Experiments with cold atoms trapped in optical lattices offer the potential to realize a variety of novel phases but suffer from severe spatial inhomogeneity that can obscure signa…
Quantum Phase Transition in a Heisenberg Antiferromagnet on a Square Lattice with Strong Plaquette Interactions
A. Fabricio Albuquerque, Matthias Troyer, Jaan Oitmaa
We present numerical results for an Heisenberg antiferromagnet on a inhomogeneous square lattice with tunable interaction between spins belonging to different plaquettes. E…
The Spin-1 Heisenberg Antiferromagnet: New Results from Series Expansions
J. Oitmaa, C. J. Hamer
We calculate ground state properties (energy, magnetization, susceptibility) and one-particle spectra for the Heisenberg antiferromagnet with easy-axis or easy-plane single…