Kosterlitz-Thouless and Potts transitions in a generalized XY model

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We present extensive numerical simulations of a generalized XY model with nematic-like terms recently proposed by Poderoso et al [PRL 106(2011)067202]. Using finite size scaling and focusing on the q=3 case, we locate the transitions between the paramagnetic (P), the nematic-like (N) and the ferromagnetic (F) phases. The results are compared with the recently derived lower bounds for the P-N and P-F transitions. While the P-N transition is found to be very close to the lower bound, the P-F transition occurs significantly above the bound. Finally, the transition between the nematic-like and the ferromagnetic phases is found to belong to the 3-states Potts universality class.