论文标题
拓扑和淋巴结超导体kagome镁分子
Topological and nodal superconductor kagome magnesium triboride
论文作者
论文摘要
最近，Kagome化合物激发了人们的兴趣，并取得了巨大的进步，例如在超导性和拓扑领域。在这里，我们可以通过外部应力预测具有计算出的TC〜12.2 K和TC〜15.4 K的不同Kagome Triboride（MGB3）超导体，这是所报道的各种Kagome型超导体中潜在最高的。我们揭示了其各种异国情调的物理特性，包括范霍夫（Van Hove）的奇异性，平面，多个狄拉克点和非平凡的拓扑结构。该系统可以通过两种波段模型来描述，在费米表面上具有高度各向异性的超导差距。最近开发的对称指标方法揭示了其拓扑和淋巴结超导性的性质。我们的结果表明，MGB3可以是研究Kagome结构中的外来物理的新平台，并铺平了一种寻找具有XY3型Kagome晶格的更多超导体和拓扑材料的方法。
Recently the kagome compounds have inspired enormous interest and made some great progress such as in the field of superconductivity and topology. Here we predict a different kagome magnesium triboride (MgB3) superconductor with a calculated Tc ~12.2 K and Tc ~15.4 K by external stress, the potentially highest among the reported diverse kagome-type superconductors. We reveal its various exotic physical properties including the van Hove singularity, flat-band, multiple Dirac points, and nontrivial topology. The system can be described by a two-band model with highly anisotropic superconducting gaps on Fermi surfaces. Its topological and nodal superconducting nature is unveiled by a recently developed symmetry indicators method. Our results suggest that MgB3 can be a new platform to study exotic physics in the kagome structure, and pave a way to seek for more superconductors and topological materials with XY3-type kagome lattice.
