534 citations · 3.1k across the 80 of their papers we have counts for
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Thermodynamics of the Spin-1/2 Antiferromagnetic Uniform Heisenberg Chain
A. Klümper, D. C. Johnston
We present a new application of the traditional thermodynamic Bethe ansatz to the spin-1/2 antiferromagnetic uniform Heisenberg chain and derive exact nonlinear integral equations…
Exact Thermodynamics of Disordered Impurities in Quantum Spin Chains
A. Klümper, A. A. Zvyagin
Exact results for the thermodynamic properties of ensembles of magnetic impurities with randomly distributed host-impurity couplings in the quantum antiferromagnetic Heisenberg mod…
Finite Temperature DMRG Investigation of the Spin-Peierls Transition in CuGeO
A. Klümper, R. Raupach, F. Schönfeld
We present a numerical study of thermodynamical properties of dimerized frustrated Heisenberg chains down to extremely low temperatures with applications to CuGeO. A variant of…
A new integrable two parameter model of strongly correlated electrons in one dimension
R. Z. Bariev, A. Klümper, J. Zittartz
A new one-dimensional fermion model depending on two independent interaction parameters is formulated and solved exactly by the Bethe ansatz method. The Hamiltonian of the model co…
Exact solution of new integrable nineteen-vertex models and quantum spin-1 chains
A. Klümper, S. I. Matveenko, J. Zittartz
New exactly solvable nineteen vertex models and related quantum spin-1 chains are solved. Partition functions, excitation energies, correlation lengths, and critical exponents are…
Exact Groundstates for Antiferromagnetic Spin-One Chains with Nearest and Next-Nearest Neighbour Interactions
C. Lange, A. Klümper, J. Zittartz
We have found the exact ground state for a large class of antiferromagnetic spin-one chains with nearest and next-nearest neighbour interactions. The ground state is characterized…
Critical exponents of a multicomponent anisotropic t-J model in one dimension
R. Z. Bariev, A. Klümper, A. Schadschneider +1
A recently presented anisotropic generalization of the multicomponent supersymmetric model in one dimension is investigated. This model of fermions with general spin- is s…
Exact solution of a one-dimensional fermion model with interchain tunneling
R. Z. Bariev, A. Klümper, A. Schadschneider +1
A fermion model consisting of two chains with interchain tunneling is formulated and solved exactly by the Bethe ansatz method. The interchain tunneling leads to Cooper pair like b…
Matrix-product-groundstates for one-dimensional spin-1 quantum antiferromagnets
A. Klümper, A. Schadschneider, J. Zittartz
We have found the exact groundstate for a large class of antiferromagnetic spin-1 models with nearest-neighbour interactions on a linear chain. All groundstate properties can be ca…
Excitation spectrum and critical exponents of a one-dimensional integrable model of fermions with correlated hopping
R. Z. Bariev, A. Klümper, A. Schadschneider +1
We investigate the excitation spectrum of a model of colour fermions with correlated hopping which can be solved by a nested Bethe ansatz. The gapless excitations of particle-h…