费米子光晶格系统中的超固态
Supersolid state in fermionic optical lattice systems
摘要：
将实空间动力学平均场论与二位点杂质求解器相结合，研究了囚禁在具有谐波约束的光晶格中的超冷费米子原子。通过计算具有不同团簇的系统中的局域粒子密度和对势，讨论了棋盘格模式的密度波态与s波超流共存的超固态的稳定性。阐明了束缚势在超固态的稳定中起着至关重要的作用。得到了几种有效粒子密度下的相图。
英文摘要：
We study ultracold fermionic atoms trapped in an optical lattice with harmonic confinement by combining the real-space dynamical mean-field theory with a two-site impurity solver. By calculating the local particle density and the pair potential in the systems with different clusters, we discuss the stability of a supersolid state, where an s-wave superfluid coexists with a density-wave state of checkerboard pattern. It is clarified that a confining potential plays an essential role in stabilizing the supersolid state. The phase diagrams are obtained for several effective particle densities.
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