First and second global sound velocity of a Bose gas across the transition to Bose-Einstein condensation
A. R. Fritsch, P. E. S. Tavares, Franklin J. Vivanco +3 more
We present an alternative approach for determining the sound modes in atomic Bose-Einstein condensates, based on thermodynamic global variables. The total number of trapped atoms was carefully studied as a function of temperature across the phase transition, at constant volume. It allowed us to evaluate the first and second sound independently resulting in consistent values from the quantum to classical regime, in good agreement with previous results found in the literature. We also provide some insight on the dominant mode, either thermal or superfluid, on each sound velocity depending on the temperature range
•Jun 21, 2016•1 citation