17 citations · 33 across the 2 of their papers we have counts for
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cond-mat.str-el2008★ 16 cited
Two-particle bound states and one-particle structure factor in a Heisenberg bilayer system
A. Collins, C. J. Hamer
The S=1/2 Heisenberg bilayer spin model at zero temperature is studied in the dimerized phase using analytic triplet-wave expansions and dimer series expansions. The occurrence of…
cond-mat.str-el2006★ 17 cited
A modified triplet-wave expansion method applied to the alternating Heisenberg chain
A. Collins, C. J. Hamer, Zheng Weihong
An alternative triplet-wave expansion formalism for dimerized spin systems is presented, a modification of the 'bond operator' formalism of Sachdev and Bhatt. Projection operators…
cond-mat.str-el2005
The Union Jack model: a quantum spin model with frustration on the square lattice
A. Collins, J. McEvoy, D. Robinson +2
A new quantum spin model with frustration, the `Union Jack' model on the square lattice, is analyzed using spin-wave theory. For small values of the frustrating coupling , the s…