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Collisionless and hydrodynamic excitations of trapped boson-fermion mixtures
Liu, XJ; Hu, H; Liu, XJ , Univ Florence, European Lab Nonlinear Spect, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.
2003
发表期刊PHYSICAL REVIEW A
ISSN1050-2947
卷号67期号:2页码:-
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.
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
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
学科领域Physics
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收录类别SCI
WOS记录号WOS:000181361200099
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被引频次:39[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13363
专题理论物理所1978-2010年知识产出
通讯作者Liu, XJ , Univ Florence, European Lab Nonlinear Spect, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.
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Liu, XJ,Hu, H,Liu, XJ , Univ Florence, European Lab Nonlinear Spect, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.. Collisionless and hydrodynamic excitations of trapped boson-fermion mixtures[J]. PHYSICAL REVIEW A,2003,67(2):-.
APA Liu, XJ,Hu, H,&Liu, XJ , Univ Florence, European Lab Nonlinear Spect, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy..(2003).Collisionless and hydrodynamic excitations of trapped boson-fermion mixtures.PHYSICAL REVIEW A,67(2),-.
MLA Liu, XJ,et al."Collisionless and hydrodynamic excitations of trapped boson-fermion mixtures".PHYSICAL REVIEW A 67.2(2003):-.
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