Evidence of finite-momentum pairing in a centrosymmetric bilayer
Evidence of finite-momentum pairing in a centrosymmetric bilayer
复制标题
中心对称双层中有限动量配对的证据
DOI：
10.1038/s41567-023-02202-4
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发表时间：
2023
期刊：
影响因子：
19.6
通讯作者：
Jurgen Smet
中科院分区：
文献类型：
--
作者：
Dong Zhao;Lukas Debbeler;Matthias Kühne;Sven Fecher;Nils Gross;Jurgen Smet
以空间调制的阶参量为特征的相位是反直觉的，因为调制会带来熵惩罚。它在超导体中可能存在的前提是，库柏对的形成仅限于费米表面的某些部分，并且库柏对携带的动量超过泡利极限。这一预测激发了在有机超导体、重费米子化合物和铜酸盐中识别这种非均匀超导态的实验努力。在这里，我们报告了另一种类型的有限动量配对的证据，它表现在泡利极限以下。它是由轨道效应驱动的，不依赖于费米曲面分割。我们通过远程嵌入在六边形二硫化钼双分子层中获得了这种空间调制超导态的证据，这种超导态在两层之间都提供了平衡的掺杂和稳定的面外相干性。以有限质心动量形成的库珀对非常罕见。现在有证据表明，在双层材料中，这种情况可以在泡利极限以下发生。
A phase characterized by a spatially modulated order parameter is counter-intuitive because of the entropy penalty that the modulations incur. Its possible existence in superconductors was first proposed under the condition that the formation of Cooper pairs is limited to some segments of the Fermi surface and that the Cooper pairs carry momentum above the Pauli limit. This prediction motivated experimental efforts to identify such non-uniform superconducting states in organic superconductors, heavy fermion compounds and cuprates. Here we report evidence of another type of finite-momentum pairing that manifests below the Pauli limit. It is driven by the orbital effect and does not rely on Fermi surface segmentation. We have evidence of this spatially modulated superconducting state in a hexagonal MoS2 bilayer through remote intercalation that offers both balanced doping and firm out-of-plane coherence across both layers. Cooper pairs that form with finite centre-of-mass momentum are rare. Now there is evidence that this can happen below the Pauli limit in a bilayer material.
影响因子：
16.6
作者：
de la Barrera SC;Sinko MR;Gopalan DP;Sivadas N;Seyler KL;Watanabe K;Taniguchi T;Tsen AW;Xu X;Xiao D;Hunt BM
通讯作者：
Hunt BM
影响因子：
56.9
作者：
Edkins, S. D.;Kostin, A.;Hamidian, M. H.
通讯作者：
Hamidian, M. H.