论文标题
超导性和二维杂项中超导性和带拓扑的铁电调谐
Ferroelectric tuning of superconductivity and band topology in a two-dimensional heterobilayer
论文作者
论文摘要
与伴随的非平凡带拓扑结合可调超导性的实现在概念上是有趣的，对于超导设备和拓扑量子计算而言是非常理想的。基于第一原理的计算，在这里，我们介绍了同时可调超导过渡温度（TC）的第一个预测和在超导IRTE2覆盖层在铁电IN2SE3单层上的超导IRTE2叠加仪中的第一个预测。我们首先证明，由于费米水平附近的电荷重新分配，TC从IRTE2纳米湖（TC〜3 K）中大大提高了TC。更重要的是，TC显示出敏感的取决于IN2SE3极化，而〜（8-10）k的较高的TC归因于增强的层间层电子 - phonon-Phonon耦合，当极化向下时。随着极化从向下逆转，频带拓扑也从微不足道转变为非琐事。这些发现为使用可逆且非挥发性的方法在二维杂波和相关的异质结构中同时调整超导性和带状拓扑提供了物理逼真的平台。
Realization of tunable superconductivity with concomitant nontrivial band topology is conceptually intriguing and highly desirable for superconducting devices and topological quantum computation. Based on first-principles calculations, here we present the first prediction of simultaneously tunable superconducting transition temperature (Tc) and band topology in a superconducting IrTe2 overlayer on a ferroelectric In2Se3 monolayer. We first demonstrate that the Tc is substantially enhanced from that of IrTe2 nanoflakes (Tc ~3 K) due to significant charge repartitioning around the Fermi level. More importantly, the Tc is shown to sensitively depend on the In2Se3 polarization, with the higher Tc of ~(8-10) K attributed to enhanced interlayer electron-phonon coupling when the polarization is downward. The band topology is also switched from trivial to nontrivial as the polarization is reversed from upward to downward. These findings provide physically realistic platforms for simultaneously tuning superconductivity and band topology in two-dimensional heterobilayers and related heterostructures using a reversible and nonvolatile approach.
