Pair correlations of a spin-imbalanced Fermi gas on two-leg ladders.
Pair correlations of a spin-imbalanced Fermi gas on two-leg ladders.
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DOI：
10.1103/physrevlett.102.076403
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发表时间：
2008-09
影响因子：
8.6
通讯作者：
A. Feiguin;F. Heidrich-Meisner
中科院分区：
文献类型：
--
作者：
A. Feiguin;F. Heidrich-Meisner
利用密度矩阵重正化群方法研究了自旋不平衡的具有吸引相互作用的两条腿梯子的对关联。我们确定的化学势和磁场，可以窝藏富尔德-费雷尔-拉金-奥夫钦尼科夫-（FFLO-）一样的物理跨越的相图中的区域。对结构因子的结果显示出多个配对波矢量，证实了类似FFLO的相关性的存在。我们进一步讨论了相位分离的情况下引起的谐波陷阱，这不同于孤立链的情况。
We study the pair correlations of a spin-imbalanced two-leg ladder with attractive interactions, using the density matrix renormalization group method. We identify regions in the phase diagram spanned by the chemical potential and the magnetic field that can harbor Fulde-Ferrell-Larkin-Ovchinnikov- (FFLO-)like physics. Results for the pair structure factor, exhibiting multiple pairing wave vectors, substantiate the presence of FFLO-like correlations. We further discuss phase separation scenarios induced by a harmonic trap, which differ from the case of isolated chains.