论文标题
弱耦合准二元超导体的物理特性
Physical properties of weak-coupling quasiperiodic superconductors
论文作者
论文摘要
我们从数值上研究了准碘超导体的物理特性，目的是了解准晶体中的超导性。将彭罗斯瓷砖上的有吸引力的哈伯德模型视为一个简单的理论模型，我们计算了各种基本的超导属性，并找到了与Bardeen-Cooper-Schrieffer理论的通用值的偏差。特别是，我们发现超导过渡时的特定热量的跳跃比该通用值小约10-20％，这与对超导AL-MG-ZN准晶合金获得的实验结果一致。此外，我们计算电流 - 电压特性，并发现电流随着周期系统的迅速增加而逐渐随着Penrose瓷砖的电压而逐渐增加。这些区别源于准膜系统的非平凡配对特征。
We numerically study the physical properties of quasiperiodic superconductors with the aim of understanding superconductivity in quasicrystals. Considering the attractive Hubbard model on the Penrose tiling as a simple theoretical model, we calculate various basic superconducting properties and find deviations from the universal values of the Bardeen-Cooper-Schrieffer theory. In particular, we find that the jump of the specific heat at the superconducting transition is about 10-20% smaller than that universal value, in consistency with the experimental results obtained for the superconducting Al-Mg-Zn quasicrystalline alloy. Furthermore, we calculate current-voltage characteristics and find that the current gradually increases with the voltage on the Penrose tiling in contrast to a rapid increase in the periodic system. These distinctions originate from the nontrivial Cooper pairing characteristic to the quasiperiodic system.
