164 citations · 209 across the 5 of their papers we have counts for
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Excitation spectra and ground state properties of the layered spin-1/2 frustrated antiferromagnets Cs_2CuCl_4 and Cs_2CuBr_4
John O. Fjaerestad, Weihong Zheng, Rajiv R. P. Singh +2
We use series expansion methods to study ground- and excited-state properties in the helically ordered phase of spin-1/2 frustrated antiferromagnets on an anisotropic triangular la…
Excitation spectra of the spin-1/2 triangular-lattice Heisenberg antiferromagnet
Weihong Zheng, John O. Fjaerestad, Rajiv R. P. Singh +2
We use series expansion methods to calculate the dispersion relation of the one-magnon excitations for the spin-1/2 triangular-lattice nearest-neighbor Heisenberg antiferromagnet a…
Critical Behaviour of One-particle Spectral Weights in the Transverse Ising Model
C. J. Hamer, J. Oitmaa, Weihong Zheng +1
We investigate the critical behaviour of the spectral weight of a single quasiparticle, one of the key observables in experiment, for the particular case of the transverse Ising mo…
Crossover of spectral features from Dimerized to Haldane behavior in alternating antiferromagnetic-ferromagnetic spin-half chains
Weihong Zheng, Chris Hamer, Rajiv Singh
We calculate the excitation spectrum and spectral weights of the alternating antiferromagnetic-ferromagnetic spin-half Heisenberg chain with exchange couplings and as a…
Single-hole properties of the t-J model on the honeycomb lattice
Andreas Luscher, Andreas Laeuchli, Weihong Zheng +1
Motivated by the possible charge ordering in the recently discovered superconductor Na_xCoO_2 yH_2O, which at filling x=1/3 would correspond to a half-filled honeycomb lattice, we…
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…