Effect of impurities on the transition temperature of a dilute dipolar tapped Bose gase

TL;DR

This paper investigates how impurities affect the transition temperature of a dipolar Bose gas using a two-fluid model, deriving a formula that accounts for contact, dipole-dipole, and impurity interactions, with potential experimental measurement methods.

Contribution

It introduces a derived formula for the transition temperature shift in dipolar Bose gases considering impurities and interactions, extending previous models.

Findings

Impurities cause measurable shifts in transition temperature.

The shift includes contributions from contact, dipole-dipole, and impurity interactions.

Experimental setups like isotropic traps and Feshbach resonance can observe these effects.

Abstract

By using two-fluid model the effect of impurities on the transition temperature of a dipolar trapped Bose gas is investigated. By treating Gaussian spatial correlation for impurities from the interaction modified spectra of the system, the formula for the shift of transition temperature is derived. The shift of the transition temperature contains essentially three contributions due to contact, dipole-dipole and impurity interactions. Applying our results to Dipolar Bose gases show that the shift of the transition temperature due to impurities could be measured for isotropic trap (dipole-dipole contributions is zero) and Feshbach resonance technique (contact potential contribution is negligible).