二维光学超晶格中d波超流性的制备与检测
Preparation and detection of d-wave superfluidity in two-dimensional optical superlattices
摘要：
我们提出了一种利用超冷费米子原子在二维光学超晶格中产生和探测d波超流性的可控方法。我们的方案包括准备一个最近邻耦合的正方形斑阵或“超斑阵”阵列，并使用它们作为构建块来构建d波超流态。我们描述了如何使用这样的系统中的相干动力学演化实验探测配对机制。我们还推导出零温度相图的费米子在棋盘格（许多弱耦合的元格），并表明，通过调整元格间隧穿自旋相关或改变填充因子可以驱动系统进入d波超流相或库珀对密度波相。我们讨论了使用噪声相关测量实验探测这些阶段。
英文摘要：
We propose a controlled method to create and detect d-wave superfluidity with ultracold fermionic atoms loaded in two-dimensional optical superlattices. Our scheme consists in preparing an array of nearest-neighbor coupled square plaquettes or ``superplaquettes'' and using them as building blocks to construct a d-wave superfluid state. We describe how to use the coherent dynamical evolution in such a system to experimentally probe the pairing mechanism. We also derive the zero temperature phase diagram of the fermions in a checkerboard lattice (many weakly coupled plaquettes) and show that by tuning the inter-plaquette tunneling spin-dependently or varying the filling factor one can drive the system into a d-wave superfluid phase or a Cooper pair density wave phase. We discuss the use of noise correlation measurements to experimentally probe these phases.
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