Heavy quark free energies and screening at finite temperature and density

We study the free energies of heavy quarks calculated from Polyakov loop correlation functions in full 2-flavour QCD using the p4-improved staggered fermion action. A small but finite baryon number density is included via Taylor expansion of the fermion determinant in the baryo-chemical potential µ. For temperatures above T c we extract Debye screening masses from the large distance behaviour of the free energies and compare their µ-dependence to perturbative results. Heavy quark free energies and Debye screening masses at finite temperature and density Matthias Döring