1205.2861 (Zoran Ristivojevic et al.)

Exact asymptotic behavior of correlation functions for disordered
spin-1/2 XXZ chains    [PDF]

Zoran Ristivojevic, Aleksandra Petkovic, Thierry Giamarchi

We consider a XXZ spin-1/2 chain in the presence of several types of disorder that do not break the XY symmetry of the system. We calculate the complete asymptotic form of the spin-correlation functions at zero temperature at the transition between liquid and disordered phase that occurs for a special value of anisotropy in the limit of small disorder. Apart from a universal power law decay of correlations, we find additional logarithmic corrections due to marginally irrelevant operator of disorder.

View original: http://arxiv.org/abs/1205.2861