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题名: Collisionless and hydrodynamic excitations of trapped boson-fermion mixtures
作者: Liu, XJ ;  Hu, H
刊名: PHYSICAL REVIEW A
出版日期: 2003
卷号: 67, 期号:2, 页码:-
关键词: QUANTUM DEGENERATE BOSE ;  TIME-DEPENDENT TRAPS ;  EINSTEIN CONDENSATE ;  COLLECTIVE EXCITATIONS ;  ZERO-TEMPERATURE ;  DYNAMICAL STABILITY ;  FREQUENCY-SHIFTS ;  MIXED CONDENSATE ;  SCISSORS MODE ;  PHASE-DIAGRAM
学科分类: Physics
通讯作者: Liu, XJ , Univ Florence, European Lab Nonlinear Spect, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.
部门归属: Univ Florence, European Lab Nonlinear Spect, I-50019 Sesto Fiorentino, Italy; Univ Florence, Dipartimento Fis, I-50019 Sesto Fiorentino, Italy; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; Int Ctr Theoret Phys, I-34100 Trieste, Italy; Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China
英文摘要: Within a scaling ansatz formalism plus Thomas-Fermi approximation, we investigate the collective excitations of a harmonically trapped boson-fermion mixture in the collisionless and hydrodynamic limit at low temperature. Both the monopole and quadrupole modes are considered in the presence of spherical as well as cylindrically symmetric traps. In the spherical traps, the frequency of the monopole mode coincides in the collisionless and hydrodynamic regime, suggesting that it might be undamped in all collisional regimes. In contrast, for the quadrupole mode, the frequency differs largely in these two limits. In particular, we find that in the hydrodynamic regime the quadrupole oscillations with equal bosonic and fermionic amplitudes generate an exact eigenstate of the system, regardless of the boson-fermion interaction. This resembles the Kohn mode for the dipole excitation. We discuss in some detail the behavior of monopole and quadrupole modes as a function of boson-fermion coupling at different boson-boson interaction strength. Analytic solutions valid at weak and medium fermion-boson coupling are also derived and discussed.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000181361200099
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13363
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Liu, XJ,Hu, H. Collisionless and hydrodynamic excitations of trapped boson-fermion mixtures[J]. PHYSICAL REVIEW A,2003,67(2):-.
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