Thermoelectric power above the Kosterlitz-Thouless transition

Thermoelectric transport due to the motion of free unbound vortices above the Kosterlitz-Thouless transition temperature is considered. It is shown that the Magnus force, which appears under the influence of the temperature gradient, leads to a nonzero thermopower at a temperature above the Kosterlitz-Thouless transition temperature TKT, but below the mean-field (Ginzburg-Landau) critical temperature TGL. The exponential inverse-square-root reduced-temperature dependence of the thermopower above TKT is predicted with a consequent broadening of the superconducting transition detected by means of thermopower measurements. The case of the clean superconductor is analyzed