Feiguin A E, Heidrich-Meisner F
Microsoft Project Q, University of California, Santa Barbara, California 93106, USA.
Phys Rev Lett. 2009 Feb 20;102(7):076403. doi: 10.1103/PhysRevLett.102.076403. Epub 2009 Feb 19.
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.
我们使用密度矩阵重整化群方法研究了具有吸引相互作用的自旋不平衡两腿梯子的对关联。我们确定了相图中由化学势和磁场跨越的区域，这些区域可能存在类富尔德-费雷尔-拉金-奥夫钦尼科夫（FFLO）物理现象。对结构因子的结果显示出多个配对波矢，证实了类FFLO关联的存在。我们进一步讨论了由谐波陷阱引起的相分离情况，这与孤立链的情况不同。
