论文标题
平方型晶格中的扁平频带超导性
Flat band superconductivity in the square-octagon lattice
论文作者
论文摘要
在扭曲的双层石墨烯中发现超导性的发现引发了人们对平移超导性的兴趣。在这里，我们研究了方形的晶格，当新的邻居跳跃或外部磁场添加到系统中时，它也表现出两个完美的扁平带。在存在现场相互作用的存在下，我们计算了超导相图，并找到两个超导圆顶，如几种非常规的超导体中所观察到的那样。临界温度显示对耦合常数的线性依赖性，这表明超导性可能达到方形晶格中的高温。我们的模型可以使用光子或超低原子晶格实验实现。
The discovery of superconductivity in twisted bilayer graphene has triggered a resurgence of interest in flat-band superconductivity. Here, we investigate the square-octagon lattice, which also exhibits two perfectly flat bands when next-nearest neighbour hopping or an external magnetic field are added to the system. We calculate the superconducting phase diagram in the presence of on-site attractive interactions and find two superconducting domes, as observed in several types of unconventional superconductors. The critical temperature shows a linear dependence on the coupling constant, suggesting that superconductivity might reach high temperatures in the square-octagon lattice. Our model could be experimentally realized using photonic or ultracold atoms lattices.
