Correlation effects on atom-density profiles of one-and two-dimensional polarized atomic Fermi gases loaded on an optical lattice
Correlation effects on atom-density profiles of one-and two-dimensional polarized atomic Fermi gases loaded on an optical lattice
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DOI：
10.1103/physreva.77.053614
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发表时间：
2008-05
影响因子：
2.9
通讯作者：
M. Machida;S. Yamada;M. Okumura;Y. Ohashi;H. Matsumoto
中科院分区：
文献类型：
--
作者：
M. Machida;S. Yamada;M. Okumura;Y. Ohashi;H. Matsumoto
本文研究了布居数不平衡的一维和二维双组元囚禁费米气体中光学晶格势的影响。利用精确对角化方法和密度矩阵重整化群方法，从基态多体波函数出发，计算了各种布居不平衡情况下原子密度随吸引相互作用强度的变化.数值结果表明，虽然在没有光学晶格的实验中观察到的超流核和多余原子的壳云之间发生相分离，但与非晶格情况相比，粒子数不平衡通常仍然存在于核区域。强吸引区数值结果的本质可以用一个由库珀对和过剩主费米子组成的有效模型来解释。
We investigate effects of optical lattice potential in one- and two-dimensional two-component trapped Fermi gases with population imbalances. Using the exact diagonalization and the density matrix renormalization group methods complementarily, we calculate the atom-density profile from the ground state many-body wave function as a function of attractive interaction strength for various population imbalances. The numerical results reveal that although a phase separation between the superfluid core and the shell cloud of excess atoms occurs as observed in experiments without the optical lattice, the population imbalance generally remains in the core region in contrast to the nonlattice cases. The essence of the numerical results in a strong attractive regime can be explained by an effective model composed of Cooper pairs and excess major fermions.