Molecular Bose-Einstein condensation in a Bose gas with a wide Feshbach resonance at finite temperatures
Molecular Bose-Einstein condensation in a Bose gas with a wide Feshbach resonance at finite temperatures
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有限温度下具有宽费什巴赫共振的玻色气体中的分子玻色-爱因斯坦凝聚
DOI：
10.1103/physreva.81.023613
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发表时间：
2010-02
影响因子：
2.9
通讯作者：
Yin, Lan
中科院分区：
文献类型：
--
作者：
Yu, Zeng-Qiang;Yin, Lan
在harree - fock能量和配对间隙自洽确定的单通道平均场方法下，研究了均匀玻色气体中Feshbach分子在有限温度下的玻色-爱因斯坦凝聚（BEC）。在分子- bec态中，原子激发是间隙的，分子激发是无间隙的。费什赫分子的结合能是由多体效应引起的真空值偏移。当原子的散射长度a{sub s}为负时，系统由于负压缩性而发生机械坍缩。系统在散射长度为正的大部分区域是稳定的。然而，在共振附近的低温下，分子-BEC态消失，原子和分子的相干混合物发生机械坍缩。
Bose-Einstein condensation (BEC) of Feshbach molecules in a homogeneous Bose gas is studied at finite temperatures in a single-channel mean-field approach where the Hartree-Fock energy and pairing gap are determined self-consistently. In the molecular-BEC state, the atomic excitation is gapped and the molecular excitation is gapless. The binding energy of Feshbach molecules is shifted from the vacuum value by many-body effects. When the scattering length a{sub s} of the atoms is negative, the system is subject to mechanical collapse due to negative compressibility. The system is stable in most regions with positive scattering lengths. However, at low temperatures near the resonance, the molecular-BEC state vanishes, and the coherent mixture of atomic and molecular BEC is subject to mechanical collapse.
DOI：
10.1017/cbo9780511524257
发表时间：
1993-08
期刊：
--
影响因子：
--
作者：
A. Griffin
通讯作者：
A. Griffin