Dynamics of quantum spin chains and multi-fermion excitation continua (2005)
Derzhko, O., Krokhmalskii, T., Stolze, J., Müller, G.
We use the Jordan-Wigner representation to study dynamic quantities for the spin-1/2 XX chain in a transverse magnetic field. We discuss in some detail the properties of the four-fermion excitation...
Disorder Induced Quantum Phase Transition in Random-Exchange Spin-1/2 Chains (2001)
Hamacher, K., Stolze, J., Wenzel, W.
We investigate the effect of quenched bond-disorder on the anisotropic spin-1/2 (XXZ) chain as a model for disorder induced quantum phase transitions. We find non-universal behavior of the average...
Dynamics of spin correlations in the spin-1/2 isotropic XY chain in a transverse field (2000)
Derzhko, O., Krokhmalskii, T., Stolze, J.
Dynamic xx spin pair correlation functions for the isotropic spin-1/2 XY chain are calculated numerically for long open chains in the presence of a transverse magnetic field at finite temperature. As...