- The University of SydneyAU578 papers
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- Data61AU267 papers
- University of CambridgeGB253 papers
- Australian Astronomical ObservatoryAU246 papers
- Centre for Quantum Computation and Communication TechnologyAU243 papers
- Australian Defence Force AcademyAU233 papers
- ARC Centre of Excellence for All-sky AstrophysicsAU232 papers
- Swinburne University of TechnologyAU209 papers
14 papers · 2 filters
Linked Cluster Series Expansions for Two-Particle Bound States
Weihong Zheng, C. J. Hamer, R. R. P. Singh +2
We develop strong-coupling series expansion methods to study two-particle spectra of quantum lattice models. At the heart of the method lies the calculation of an effective Hamilto…
Deconfinement Transition and Bound States in Frustrated Heisenberg Chains: Regimes of Forced and Spontaneous Dimerization
Weihong Zheng, C. J. Hamer, R. R. P. Singh +2
We use recently developed strong-coupling expansion methods to study the two-particle spectra for the frustrated alternating Heisenberg model, consisting of an alternating nearest…
New quantum phase transitions in the two-dimensional J1-J2 model
O. P. Sushkov, J. Oitmaa, Zheng Weihong
We analyze the phase diagram of the frustrated Heisenberg antiferromagnet, the J1-J2 model, in two dimensions. Two quantum phase transitions in the model are already known: the sec…
Numerical Studies of the two-leg Hubbard ladder
Zheng Weihong, J. Oitmaa, C. J. Hamer +1
The Hubbard model on a two-leg ladder structure has been studied by a combination of series expansions at T=0 and the density-matrix renormalization group. We report results for th…
Local Spin Correlations in Heisenberg Antiferromagnets
Zheng Weihong, J. Oitmaa
We use linked cluster series expansion methods to estimate the values of various short distance correlation functions in Heisenberg antiferromagnets at T=0, for dimension $…
Strong-Coupling Expansions for Multiparticle Excitations: Continuum and Bound States
S. Trebst, H. Monien, C. J. Hamer +2
We present a new linked cluster expansion for calculating properties of multiparticle excitation spectra to high orders. We use it to obtain the two-particle spectra for systems of…