Multivalley Superconductivity in Monolayer Transition Metal Dichalcogenides.
Multivalley Superconductivity in Monolayer Transition Metal Dichalcogenides.
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DOI：
10.1021/acs.nanolett.2c02947
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发表时间：
2022-09
期刊：
影响因子：
10.8
通讯作者：
Dongdong Ding;Zhuangzhuang Qu;Xiangyan Han;Chunrui Han;Q. Zhuang;Xiang-Long Yu;R. Niu;Zhiyu Wang;Zhuoxian Li;Z. Gan;Jiansheng Wu;Jianming Lu
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文献类型：
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作者：
Dongdong Ding;Zhuangzhuang Qu;Xiangyan Han;Chunrui Han;Q. Zhuang;Xiang-Long Yu;R. Niu;Zhiyu Wang;Zhuoxian Li;Z. Gan;Jiansheng Wu;Jianming Lu
在过渡金属二硫属化物（TMD）中，费米面上具有反对称自旋织构的Ising超导性由于其奇异的配对和拓扑性质而引起了人们的广泛兴趣。然而，目前尚不清楚具有巨大自旋分裂的Q谷是否参与重掺杂半导体2 H-TMD的超导电性。在这里，利用高品质的单层WS 2的六方氮化硼薄片，我们报告了一个离子门诱导超导圆顶与创纪录的高临界温度为10.6 K，伴随着一个紧急的非线性霍尔效应。的非线性表示一个额外的高迁移率的通道，这（证实了第一原理计算）可以归因于人口的Q谷的发展。因此，在K和Q处的多粒子布居被认为是发展超导性的先决条件。Q谷的参与也提供了见解的自旋织构费米表面的伊辛超导性在大家庭的过渡金属二硫属化物。
In transition metal dichalcogenides (TMDs), Ising superconductivity with an antisymmetric spin texture on the Fermi surface has attracted wide interest due to the exotic pairing and topological properties. However, it is not clear whether the Q valley with a giant spin splitting is involved in the superconductivity of heavily doped semiconducting 2H-TMDs. Here by taking advantage of a high-quality monolayer WS2 on hexagonal boron nitride flakes, we report an ionic-gating induced superconducting dome with a record high critical temperature of ∼6 K, accompanied by an emergent nonlinear Hall effect. The nonlinearity indicates the development of an additional high-mobility channel, which (corroborated by first principle calculations) can be ascribed to the population of Q valleys. Thus, multivalley population at K and Q is suggested to be a prerequisite for developing superconductivity. The involvement of Q valleys also provides insights to the spin textured Fermi surface of Ising superconductivity in the large family of transition metal dichalcogenides.