论文标题
受阻原子绝缘子和fermions的超氟，连接到$ \ mathbb {z} _2 $ gauge fields
Obstructed Atomic Insulators and Superfluids of Fermions Coupled to $\mathbb{Z}_2$ Gauge Fields
论文作者
论文摘要
我们研究旋转 - $ \ frac {1} {2} $ fermions耦合到$ \ mathbb {z} _2 $ gauge字段。我们展示了fermion跳跃的空间调制如何允许实现各种托有高阶型拓扑的阻塞原子绝缘子。研究量规场的量子动力学在简化模型中的效果，我们发现了该系统的丰富相图，其多种超氟相位是由量规场冥想的有吸引力的相互作用引起的。这项工作的一个关键发现是，通过实现这些不同的超氟相结合的相对绑定，从BARDEEN-COOPER-SCHRIEFFER（BCS）超流体状态到紧密结合的Bose-Einenstein冷凝物（BEC）的演变。
We study spin-$\frac{1}{2}$ fermions coupled to $\mathbb{Z}_2$ gauge fields on a lattice. We show how a spatial modulation of the fermion hopping allows for the realization of various obstructed atomic insulators that host higher-order band topology. Studying the effect of quantum dynamics of the gauge fields within a simplified model, we find a rich phase diagram of this system with a number of superfluid phases arising from the attractive interactions meditated by the gauge fields. A key finding of this work is that the evolution from the Bardeen-Cooper-Schrieffer (BCS) superfluid state to a Bose-Einstein condensate (BEC) of tightly bound pairs occurs via the realization of these different superfluid phases separated by first-order transitions.
