Superconductors are topologically ordered
Annals of Physics Elsevier 313:2 (2004) 497-538
Magnetization curve of spin ice in a [111] magnetic field
Physical Review B American Physical Society (APS) 70:10 (2004) 104418
Flux expulsion and greedy bosons: frustrated magnets at large N
(2004)
Planar Pyrochlore, Quantum Ice and Sliding Ice
Journal of Statistical Physics Springer Nature 116:1-4 (2004) 755-772