基于原子薄超导体的范德华异质结构
van der Waals heterostructures based on atomically-thin superconductors
摘要：
范德华异质结构（vdWHs）允许高结晶二维（2D）材料的组装，以探索强相关系统中的维度效应和潜在的新物理场景的出现。在这项工作中，它说明了在2D超导体之间集成2D材料的可行性。特别地，提出了基于由NbSe 2/TaS 2/NbSe 2堆叠形成的空气不稳定的原子薄过渡金属二硫属化物的垂直vdWH的制造和电特性，其中TaS 2是绝缘体1T-TaS 2或金属2H-TaS 2。探测到1T-TaS_2电荷密度波的相变和NbSe_2超导电性。由于Andreev反射的VdWH电阻的增强被观察到低于NbSe 2薄片的超导转变温度。此外，在NbSe 2超导态下，在Dynes模型下分析了归一化电导随温度和场的变化，其整体行为符合Bardeen-Cooper-Schrieffer理论。这种vdWH方法可以扩展到其他2D材料，如2D磁体或拓扑绝缘体，目的是探索可能从这种组合中产生的新的涌现特性。
英文摘要：
Van der Waals heterostructures (vdWHs) allow the assembly of high-crystalline two-dimensional (2D) materials in order to explore dimensionality effects in strongly correlated systems and the emergence of potential new physical scenarios. In this work, it is illustrated the feasibility to integrate 2D materials in-between 2D superconductors. Particularly, it is presented the fabrication and electrical characterization of vertical vdWHs based on air-unstable atomically-thin transition metal dichalcogenides formed by NbSe2/TaS2/NbSe2 stacks, with TaS2 being the insulator 1T-TaS2 or the metal 2H-TaS2. Phase transitions as 1T-TaS2 charge density wave and NbSe2 superconductivity are detected. An enhancement of the vdWH resistance due to Andreev reflections is observed below the superconducting transition temperature of the NbSe2 flakes. Moreover, in the NbSe2 superconducting state, the field and temperature dependence of the normalized conductance is analyzed within the Dynes' model and the overall behavior is consistent with the Bardeen-Cooper-Schrieffer theory. This vdWH approach can be extended to other 2D materials, such as 2D magnets or topological insulators, with the aim of exploring the new emergent properties that may arise from such combinations.
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