中国物理B ›› 2009, Vol. 18 ›› Issue (2): 715-725.doi: 10.1088/1674-1056/18/2/051
• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇 下一篇
董行, 马永利
Dong Hang(董行) and Ma Yong-Li(马永利)†
摘要: Using quantum hydrodynamic approaches, we study the quantum pressure correction to the collective excitation spectrum of the interacting trapped superfluid Fermi gases in the BEC-BCS crossover. Based on a phenomenological equation of state, we derive hydrodynamic equations of the system in the whole BEC-BCS crossover regime. Beyond the Thomas--Fermi approximation, expressions of the frequency corrections of collective modes for both spherical and axial symmetric traps excited in the BEC-BCS crossover are given explicitly. The corrections of the eigenfrequencies due to the quantum pressure and their dependence on the inverse interaction strength, anisotropic parameter and particle numbers of the condensate are discussed in detail.
中图分类号: (Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)