5 citations · 7 across the 4 of their papers we have counts for
4 papers
Ferromagnetism in a hard-core boson model
A. Fledderjohann, A. Langari, E. Mueller-Hartmann +1
The problem of ferromagnetism -- associated with a ground state with maximal total spin -- is discussed in the framework of a hard-core model, which forbids the occupancy at each s…
Charge density plateaux and insulating phases in the model with ladder geometry
A. Fledderjohann, A. Langari, K. -H. Muetter
We discuss the occurrence and the stability of charge density plateaux in ladder-like systems (at zero magnetization M=0) for the cases of 2- and 3-leg ladders. Starting from…
Gap's in the antiferromagnetic Heisenberg model
A. Fledderjohann, M. Karbach, K. -H. Mütter
We study the one-dimensional spin-1/2 antiferromagnetic Heisenberg model exposed to an external field, which is a superposition of a homogeneous field and a small periodic…
Static and dynamic structure factors in the Haldane phase of the bilinear-biquadratic spin-1
K-H Muetter, A Schmitt, M Karbach +2
The excitation spectra of the T=0 dynamic structure factors for the spin, dimer, and trimer fluctuation operators as well as for the newly defined center fluctuation operator in th…