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Finite-temperature excitations of a trapped Bose-Fermi mixture
Liu, XJ; Hu, H; Liu, XJ , Univ Florence, LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.
2003
发表期刊PHYSICAL REVIEW A
ISSN1050-2947
卷号68期号:3页码:-
摘要We present a detailed study of the low-lying collective excitations of a spherically trapped Bose-Fermi mixture at finite temperature in the collisionless regime. The excitation frequencies of the condensate are calculated self-consistently using the static Hartree-Fock-Bogoliubov theory within the Popov approximation. The frequency shifts and damping rates due to the coupled dynamics of the condensate, noncondensate, and degenerate Fermi gas are also taken into account by means of the random-phase approximation and linear-response theory. In our treatment, the dipole excitation remains close to the bare trapping frequency for all temperatures considered, and thus is consistent with the generalized Kohn theorem. We discuss in some detail the behavior of monopole and quadrupole excitations as a function of the Bose-Fermi coupling. At nonzero temperatures we find that, as the mixture moves towards spatial separation with increasing Bose-Fermi coupling, the damping rate of the monopole (quadrupole) excitation increases (decreases). This provides us a useful signature to identify the phase transition of spatial separation.
部门归属Univ Florence, LENS, I-50019 Sesto Fiorentino, Italy; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; Abdus Salam Int Ctr Theoret Phys, I-34100 Trieste, Italy
关键词Einstein Condensation Collective Excitations Gas Dynamics Atoms
学科领域Physics
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收录类别SCI
WOS记录号WOS:000185716700100
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被引频次:11[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/311006/13228
专题理论物理所1978-2010年知识产出
通讯作者Liu, XJ , Univ Florence, LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.
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Liu, XJ,Hu, H,Liu, XJ , Univ Florence, LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.. Finite-temperature excitations of a trapped Bose-Fermi mixture[J]. PHYSICAL REVIEW A,2003,68(3):-.
APA Liu, XJ,Hu, H,&Liu, XJ , Univ Florence, LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy..(2003).Finite-temperature excitations of a trapped Bose-Fermi mixture.PHYSICAL REVIEW A,68(3),-.
MLA Liu, XJ,et al."Finite-temperature excitations of a trapped Bose-Fermi mixture".PHYSICAL REVIEW A 68.3(2003):-.
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