التفاصيل البيبلوغرافية
| العنوان: |
Sound modes in collisional superfluid Bose gases. |
| المؤلفون: |
Furutani, K, Tononi, A, Salasnich, L |
| المصدر: |
New Journal of Physics; Apr2021, Vol. 23 Issue 4, p1-10, 10p |
| مصطلحات موضوعية: |
BOSE-Einstein gas, SUPERFLUIDITY, SPEED of sound, TRANSITION temperature, ACOUSTIC wave propagation, SOUND measurement |
| مستخلص: |
We theoretically investigate sound modes in a weakly-interacting collisional Bose gas in D dimensions. Using the Landau's two-fluid hydrodynamics and working within the Bogoliubov theory, we observe the hybridization of the first and second sound modes for D ⩾ 2. To model the recent measurements of the sound velocities in 2D, obtained in the weakly-interacting regime and around the Berezinskii–Kosterlitz–Thouless transition temperature, we derive a refined calculation of the superfluid density, finding a fair agreement with the experiment. In the 1D case, for which experimental results are currently unavailable, we find no hybridization, triggering the necessity of future investigations. Our analysis provides a systematic understanding of sound propagation in a collisional weakly-interacting Bose gas in D dimensions. [ABSTRACT FROM AUTHOR] |
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