具有三角形阶梯的 chirality 和配对超流性
Chiral and pair superfluidity in triangular ladder produced by state-dependent Kronig-Penney lattice
AI总结：
该研究通过spin依赖性Kronig-Penney晶格实现三角形阶梯，探索了几何摩擦和可控配对跃迁，发现配对超流体和chiral超流体，并确定了XXZ自旋模型的相变点。
摘要：
我们提出了一种实现三角形阶梯的实用方法，用于超冷原子，该结构同时具有几何摩擦和非寻常的二体相互作用，并且特别可控的配对跃迁和密度诱导的隧道效应。这是通过使用空间依赖性的三脚架型原子-光耦合来创建的spin依赖性Kronig-Penney晶格。我们应用密度矩阵重整化群（DMRG）计算来推导量子相图。我们发现配对隧道效应稳定了稳健的配对超流体，其特征是配对相关性的幂律衰减。此外，由竞争的最近邻（NN）和次近邻（NNN）隧道效应引起的摩擦导致了chiral超流体的出现。最后，在高势垒范围内，我们将系统映射到XXZ自旋模型，并发现精确的相变点。
英文摘要：
We propose a concrete realization of a triangular ladder for ultracold atoms, which simultaneously hosts geometric frustration and unusual two-body interactions, and in particular controllable pair hopping and density-induced tunneling. This is done by means of a spin-dependent Kronig-Penney lattice created using a spatially-dependent tripod-type atom-light coupling. We apply density matrix renormalization group (DMRG) calculations to derive the quantum phase diagram. We find that pair tunneling stabilizes a robust pair superfluid, characterized by power-law decay of pair correlations. Additionally, a chiral superfluid arises from frustration induced by competing nearest neighbor (NN) and next-nearest neighbor (NNN) tunnelings. Finally, in the high barrier regime, we map our system onto the XXZ spin model and find the exact phase transition points.
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