Effect of impurities on the transition temperature of a dilute dipolar trapped Bose gas

摘要

By using a two-fluid model the effect of impurities on the transition temperature of a dipolar trapped Bose gasnis investigated. By treating Gaussian spatial correlation for impurities from the interaction modified spectra of thensystem, the formula for the shift of the transition temperature is derived. The shift of the transition temperaturencontains essentially three contributions due to contact, dipole-dipole, and impurity interactions. Applying ournresults to dipolar Bose gases shows that the shift of the transition temperature due to impurities could bemeasurednfor an isotropic trap (dipole-dipole contribution is zero) and the Feshbach resonance technique (contact potentialncontribution is negligible).