| Phase Diagram and Phase Separation of a Trapped Interacting Bose-Fermi Gas Mixture |
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| 作者姓名： | 马永利 |
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| 作者单位： | DepartmentofPhysics,FudanUniversity,Shanghai200433 |
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| 摘 要： | In six different regimes for a spatial phase diagram of a trapped interacting Bose-Fermi gas mixture at low temperatures, we present the conditions for the spatial demixing and separation of bosons and fermions. Starting from a semiclassically thermodynamic model for the local density functional of thermal bosons and fermions,the explicit analytical expressions for the fugacities of bosons and fermions are derived in different regimes by means of a first-order perturbation method in a local-density approximation. The critical values of the fermionboson interaction strength as a function of the fractional composition of fermions have a general feature: increase,extreme and decrease with increasing the fermionic composition slightly above Bose-Einstein critical temperature.
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| 关 键 词： | 相位图 相位分离 玻色-费尔米气体混合物 玻色-爱因斯坦冷凝物 |
Phase Diagram and Phase Separation of a Trapped Interacting Bose--Fermi Gas Mixture |
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| MA Yong-Li.Phase Diagram and Phase Separation of a Trapped Interacting Bose-Fermi Gas Mixture[J].Chinese Physics Letters,2004,21(12):2355-2358. |
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| Authors: | MA Yong-Li |
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| Affiliation: | Department of Physics, Fudan University, Shanghai 200433 |
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| Abstract: | In six different regimes for a spatial phase diagram of a trapped interacting Bose--Fermi gas mixture at low temperatures, we present the conditions for the spatial demixing and separation of bosons and fermions. Starting from a semiclassically thermodynamic model for the local density functional of thermal bosons and fermions, the explicit analytical expressions for the fugacities of bosons and fermions are derived in different regimes by means of a first-order perturbation method in a local-density approximation. The critical values of the fermion--boson interaction strength as a function of the fractional composition of fermions have a general feature: increase, extreme and decrease with increasing the fermionic composition slightly above Bose--Einstein critical temperature. |
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| Keywords: | 03 75 Hh 32 80 Pj |
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