Xiong Hongwei, Liu Shujuan, Zhang Weiping, Zhan Mingsheng
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, Peoples Republic of China.
Phys Rev Lett. 2005 Sep 16;95(12):120401. doi: 10.1103/PhysRevLett.95.120401. Epub 2005 Sep 12.
We study theoretically the ultracold two-component fermionic gases when a gradient magnetic field is used to tune the scattering length between atoms. For 6Li at the narrow resonance B0=543.25 G, it is shown that the gases would be in a coexistence of the regimes of BCS, Bose-Einstein condensation (BEC), and unitarity limit with the present experimental technique. In the case of thermal and chemical equilibrium, we investigate the density distribution of the gases and show that a double peak of the density distribution can give us a clear evidence for the coexistence of BCS, BEC, and unitarity limit.
我们从理论上研究了超冷双组分费米气体，其中利用梯度磁场来调节原子间的散射长度。对于处于窄共振B0 = 543.25 G的6Li，研究表明，利用当前的实验技术，该气体将处于BCS、玻色-爱因斯坦凝聚（BEC）和幺正极限区域的共存状态。在热平衡和化学平衡的情况下，我们研究了气体的密度分布，并表明密度分布的双峰能为BCS、BEC和幺正极限的共存提供明确证据。
