Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.5: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

An integrable S=1/2 Heisenberg chain with impurity and modified density of states — •Yahya Öz and Andreas Klümper — Bergische Universität Wuppertal

Starting from the integrable Heisenberg XXZ model by use of the R-matrix a new model with impurity and modified dispersion relation is obtained. We consider the thermodynamical approach based on the well-known finite set of non-linear integral equations (NLIE) of convolution type for obtaining the integrable modification of the spinon energy-momentum dispersion for the derivation of the thermodynamic equations of this new model. In these equations, energy e and momentum p take a new dispersion relation of the form e(p)≃ p^α for small momenta where α<1.