Broken time reversal symmetry vestigial state for a two-component superconductor in two spatial dimensions

We consider the vestigial phase with broken time reversal symmetry above the superconducting transition temperature of a two-component superconductor in two spatial dimensions. We show that, in contrast to three dimensions, a vestigial phase is in general allowed within Ginzburg-Landau theory. The vestigial phase occupies an increasing temperature region if the parameters in the Ginzburg-Landau theory give a larger energy difference between the broken time reversal symmetry phase and the other ordered phase.