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题名: Finite-temperature excitations of a trapped Bose-Fermi mixture
作者: Liu, XJ ;  Hu, H
刊名: PHYSICAL REVIEW A
出版日期: 2003
卷号: 68, 期号:3, 页码:-
关键词: EINSTEIN CONDENSATION ;  COLLECTIVE EXCITATIONS ;  GAS ;  DYNAMICS ;  ATOMS
学科分类: Physics
通讯作者: Liu, XJ , Univ Florence, LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.
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
英文摘要: 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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000185716700100
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13228
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. Finite-temperature excitations of a trapped Bose-Fermi mixture[J]. PHYSICAL REVIEW A,2003,68(3):-.
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