Hydrodynamics of a Multi-Component Bosonic Superfluid

被引:1
|
作者
Zhang, Fan [1 ]
Yin, Lan [1 ]
机构
[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
关键词
BOSE; HELIUM; INSTABILITY; DROPLETS; MIXTURE; VORTEX;
D O I
10.1088/0256-307X/40/6/066701
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We obtain the superfluid hydrodynamic equations of a multi-component Bose gas with short-ranged interactions at zero temperature under the local equilibrium assumption and show that the quantum pressure is generally present in the nonuniform case. Our approach can be extended to systems with long-range interactions such as dipole-dipole interactions by treating the Hartree energy properly. For a highly symmetric superfluid, we obtain the excitation spectrum and show that except for the density phonon, all other excitations are all degenerate. The implication of our results is discussed.
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收藏
页数:5
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