41 citations · 187 across the 21 of their papers we have counts for
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Deconfinement phase transition in a two-dimensional model of interacting plaquettes
A. Fledderjohann, A. Klümper, K. H. Mütter
A two-dimensional model of interacting plaquettes is studied by means of the real space renormalization group approach. Interactions between the plaquettes are mediated solely by s…
Real space renormalization group approach to the 2d antiferromagnetic Heisenberg model
A. Fledderjohann, A. Klümper, K. H. Mütter
The low energy behaviour of the 2d antiferromagnetic Heisenberg model is studied in the sector with total spins by means of a renormalization group procedure, which gener…
A numerical study of the formation of magnetisation plateaus in quasi one-dimensional spin-1/2 Heisenberg models
R. M. Wiessner, A. Fledderjohann, K. -H. Muetter +1
We study the magnetisation process of the one dimensional spin-1/2 antiferromagnetic Heisenberg model with modulated couplings over j=1,2,3 sites. It turns out that the evolution o…
Soft modes, Gaps and Magnetization Plateaus in 1D Spin-1/2 Antiferromagnetic Heisenberg Models
A. Fledderjohann, C. Gerhardt, M. Karbach +2
We study the one-dimensional spin-1/2 model with nearest and next-to-nearest-neighbor couplings exposed to a homogeneous magnetic field and a dimer field with period an…
The 1D spin-1/2 AF-Heisenberg model in a staggered field
A. Fledderjohann, M. Karbach, K. -H. Mütter
We investigate the scaling properties of the excitation energies and transition amplitudes of the one-dimensional spin- antiferromagnetic Heisenberg model exposed to an e…