光晶格中的相与库仑阻挫HTc铜酸盐
Phases in optical lattices vs. Coulomb frustrated HTc cuprates
摘要：
二维光晶格中的费米子原子和高温铜氧化物中的电子都可用哈伯德模型描述。然而，如果库仑挫折是负责条纹相在2D铜酸盐的相图将显着不同。两个有代表性的情况下，描述了一个简单的条纹模型没有相分离和一个平均场模型的库仑挫折的情况下，与相分离。当库仑阻挫时，两种模型都表现出反铁磁性和条纹相，而光晶格中的中性原子只在条纹模型中表现出d波超流性。计算了这两种模型下谐波约束光晶格中各相的半径和密度，发现它们具有非常不同的Mott平台和密度不连续性。我们讨论了反铁磁，条纹和超流相的密度和动量分布和相关性从飞行时间实验的观察。
英文摘要：
Fermionic atoms in 2D optical lattices and electrons in HTc cuprates may both be described by the Hubbard model. However, if Coulomb frustration is responsible for the striped phases in 2D cuprates the phase diagrams will differ markedly. Two representative scenarios are described by a simple stripe model without phase separation and a mean field model with phase separation in the absence of Coulomb frustration. When Coulomb frustrated both models display antiferromagnetism (AF) and stripe phases with d-wave superfluidity, whereas neutral atoms in optical lattices will only do so in the stripe model. Radii and densities of the various phases in harmonically confined optical lattices are calculated for the two models and have very different Mott plateaus and density discontinuities. We discuss observation of antiferromagnetic, stripe and superfluid phases in density and momentum distributions and correlations from time-of-flight experiments.
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