Engineering chiral topological superconductivity in twisted Ising superconductors
Engineering chiral topological superconductivity in twisted Ising superconductors
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DOI：
10.1103/physrevb.106.125136
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发表时间：
2022-06
影响因子：
3.7
通讯作者：
Xiao-Pei Hu;Ying Ran
中科院分区：
文献类型：
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作者：
Xiao-Pei Hu;Ying Ran
NbSe 2 或 TaS 2 等范德华材料已经证明了低至原子薄层的伊辛超导性。由于自旋轨道耦合，这些超导体的面内上临界磁场远远超出泡利极限。我们从理论上证明，由铁磁缓冲层分隔的扭曲双层伊辛超导体可以自然地具有陈数的手性拓扑超导性，这可以在 NbSe 2 / CrCl 3 / NbSe 2 等异质结构中实现。在适当的实验条件下，拓扑超导能隙可以达到 > 0 。 1 meV，导致易于观察的特征，例如低温下的量子化热霍尔传输。
Van der Waals materials like NbSe 2 or TaS 2 have demonstrated Ising superconductivity down to atomically thin layers. Due to the spin-orbit coupling, these superconductors have the in-plane upper critical magnetic field far beyond the Pauli limit. We theoretically demonstrate that, twisted bilayer Ising superconductors separated by a ferromagnetic buffer layer can naturally host chiral topological superconductivity with Chern numbers, which can be realized in heterostructures like NbSe 2 / CrCl 3 / NbSe 2 . Under appropriate experimental conditions the topological superconducting gap can reach > 0 . 1 meV, leading to readily observable signatures such as the quantized thermal Hall transport at low temperatures.