First and Second Sound Modes in a Uniform Fermi Gas

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2009,（7）
• 页码范围: 25-28
• 页数: 4页
• 语种: 英文

摘要

First and second sound modes in a uniform fermionic atom gas with Feshbach resonance are investigated in the frame of a two-fluid model at finite temperature. All thermodynamic quantities are calculated for a given thermodynamic potential The analytical results for thermodynamic quantities and sound velocities in BCS and BEC limits are obtained. The numerical rcsults show that there exists a continuous interpolation for sound velocities of the first and second sound modes at fixed T/Tc between BCS and BEC limits. The existence of the second sound mode indicates the existence of superfluidity.