2 papers
cond-mat.str-el1998
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…
cond-mat1998
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…