X iv : h ep - l at / 9 50 80 33 v 2 1 F eb 1 99 6 Critical Behaviour of the Two Dimensional Step Model
نویسندگان
چکیده
We use finite–size scaling of Lee–Yang partition function zeroes to study the critical behaviour of the two dimensional step or sgn O(2) model. We present evidence that, like the closely related XY –model, this has a phase transition from a disordered high temperature phase to a low temperature massless phase where the model remains critical. The critical parameters (including logarithmic corrections) are compatible with those of the XY –model indicating that both models belong to the same universality class.
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