Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-02-08
Phys. Rev. A 81, 023613 (2010)
Physics
Condensed Matter
Quantum Gases
13 pages, 4 figures
Scientific paper
10.1103/PhysRevA.81.023613
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 due to many-body effect. When the scattering length $a_s$ of 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.
Yin Lan
Yu Zeng-Qiang
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