Condensate Fraction Scaling and Berezinskii-Kosterlitz-Thouless Transition of Superconductivity and Superfluidity
This study uses condensate fraction scaling to accurately determine Berezinskii-Kosterlitz-Thouless (BKT) transition temperatures in 2D attractive Fermi-Hubbard models. Unlike other measures, the condensate fraction shows much smaller finite-size effects, making it a superior tool for identifying the critical temperature and characterizing superconductivity/superfluidity.