Comment on "Two Phase Transitions in the Fully frustrated XY Model"

TL;DR

This paper critically examines a recent claim about two distinct phase transitions in the fully frustrated XY model, questioning the evidence for separate chiral and U(1) transitions.

Contribution

It challenges the previous conclusions regarding the existence of two separate phase transitions in the model.

Findings

Questions the evidence for two phase transitions

Suggests the need for reevaluation of the phase transition scenario

Highlights potential issues in the original analysis

Abstract

The conclusions of a recent paper by Olsson (Phys. Rev. Lett. 75, 2758 (1995), cond-mat/9506082) about the fully frustrated XY model in two dimensions are questioned. In particular, the evidence presented for having two separate chiral and U(1) phase transitions are critically considered.