Josephson coupled Ising pairing induced in suspended MoS2 bilayers by double-side ionic gating.,Nature Nanotechnology

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Josephson coupled Ising pairing induced in suspended MoS2 bilayers by double-side ionic gating.
Nature Nanotechnology ( IF 38.1 ) Pub Date : 2019-11-04 , DOI: 10.1038/s41565-019-0564-1
O Zheliuk ₁ , J M Lu _{1,

2,

3} , Q H Chen ₁ , A A El Yumin ₁ , S Golightly ₁ , J T Ye ₁

Affiliation

Superconductivity in monolayer transition metal dichalcogenides is characterized by Ising-type pairing induced via a strong Zeeman-type spin-orbit coupling. When two transition metal dichalcogenides layers are coupled, more exotic superconducting phases emerge, which depend on the ratio of Ising-type protection and interlayer coupling strength. Here, we induce superconductivity in suspended MoS2 bilayers and unveil a coupled superconducting state with strong Ising-type spin-orbit coupling. Gating the bilayer symmetrically from both sides by ionic liquid gating varies the interlayer interaction and accesses electronic states with broken local inversion symmetry while maintaining the global inversion symmetry. We observe a strong suppression of the Ising protection that evidences a coupled superconducting state. The symmetric gating scheme not only induces superconductivity in both atomic sheets but also controls the Josephson coupling between the layers, which gives rise to a dimensional crossover in the bilayer.

中文翻译：

约瑟夫森耦合伊辛配对通过双面离子门控在悬浮的MoS2双层中诱导。

单层过渡金属二硫化氢中的超导性的特征是通过强塞曼型自旋轨道耦合诱导的伊辛型配对。当两个过渡金属二卤化钨层耦合时，会出现更多奇异的超导相，这取决于伊辛型保护层的比率和层间耦合强度。在这里，我们在悬浮的MoS2双层中诱导超导，并揭示了具有强Ising型自旋轨道耦合的耦合超导状态。通过离子液体门控从两侧对称地对双层进行门控，可以改变层间相互作用，并以局部反转反转对称的方式访问电子状态，同时保持整体反转对称性。我们观察到对Ising保护的强烈抑制，这证明了耦合的超导状态。

更新日期：2019-11-04

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