Interplay of Magnetism and Topological Superconductivity in Bilayer Kagome Metals.,Physical Review Letters

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Interplay of Magnetism and Topological Superconductivity in Bilayer Kagome Metals.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-08 , DOI: 10.1103/physrevlett.125.026401
Santu Baidya ₁ , Aabhaas Vineet Mallik ₂ , Subhro Bhattacharjee ₂ , Tanusri Saha-Dasgupta ₃

Affiliation

The binary intermetallic materials,

M_{3} {Sn}_{2}

(

M = 3 d

transition metal) present a new class of strongly correlated systems that naturally allows for the interplay of magnetism and metallicity. Using first principles calculations we confirm that bulk

{Fe}_{3} {Sn}_{2}

is a ferromagnetic metal, and show that

M = Ni

and Cu are paramagnetic metals with nontrivial band structures. Focusing on

{Fe}_{3} {Sn}_{2}

to understand the effect of enhanced correlations in an experimentally relevant atomistically thin single kagome bilayer, our ab initio results show that dimensional confinement naturally exposes the flatness of band structure associated with the bilayer kagome geometry in a resultant ferromagnetic Chern metal. We use a multistage minimal modeling of the magnetic bands progressively closer to the Fermi energy. This effectively captures the physics of the Chern metal with a nonzero anomalous Hall response over a material relevant parameter regime along with a possible superconducting instability of the spin-polarized band resulting in a topological superconductor.

中文翻译：

双层Kagome金属中的磁性和拓扑超导相互作用。

二元金属间化合物材料

{中号}_{3} 锡_{2}

（

中号 = 3 d

过渡金属）提出了一类新的强相关系统，自然可以实现磁性和金属性的相互作用。使用第一原理计算，我们确认

铁_{3} 锡_{2}

是铁磁性金属，表明

中号 = 你

和Cu是具有非平凡的能带结构的顺磁性金属。专注于

铁_{3} 锡_{2}

为了了解在实验上相关的原子薄的单个kagome双层中增强的相关性的影响，我们的从头算结果表明，尺寸限制自然地暴露了所得铁磁Chern金属中与双层kagome几何形状相关的能带结构的平坦度。我们使用逐步接近费米能量的多级最小磁带模型。这有效地捕获了Chern金属的物理性质，在材料相关的参数范围内具有非零的异常霍尔响应，以及自旋极化带的可能的超导不稳定性，从而导致了拓扑超导体。

更新日期：2020-07-08

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