Two-dimensional van der Waals heterostructures (2D-vdWHs) based on transition metal dichalcogenides (TMDs) provide unparalleled control over electronic properties. However, the interlayer coupling is challenged by the interfacial misalignment and defects, which hinders a comprehensive understanding of the intertwined electronic orders, especially superconductivity and charge density wave (CDW). Here, by using pressure to regulate the interlayer coupling of non-centrosymmetric 6R-TaS₂ vdWHs, we observe an unprecedented phase diagram in TMDs. This phase diagram encompasses successive suppression of the original CDW states from alternating H-layer and T-layer configurations, the emergence and disappearance of a new CDW-like state, and a double superconducting dome induced by different interlayer coupling effects. These results not only illuminate the crucial role of interlayer coupling in shaping the complex phase diagram of TMD systems but also pave a new avenue for the creation of a novel family of bulk heterostructures with customized 2D properties.

中文翻译：

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非中心对称范德华异质结构准二维TaS2双超导穹顶


基于过渡金属二硫属化物 (TMD) 的二维范德华异质结构 (2D-vdWH) 可提供无与伦比的电子特性控制。然而，层间耦合受到界面错位和缺陷的挑战，这阻碍了对相互交织的电子序的全面理解，特别是超导和电荷密度波（CDW）。在这里，通过使用压力调节非中心对称 6R-TaS ₂ vdWH 的层间耦合，我们在 TMD 中观察到前所未有的相图。该相图涵盖了交替的 H 层和 T 层配置对原始 CDW 态的连续抑制、新的类 CDW 态的出现和消失，以及由不同层间耦合效应引起的双超导穹顶。这些结果不仅阐明了层间耦合在形成 TMD 系统复杂相图方面的关键作用，而且为创建具有定制二维特性的新型体异质结构系列铺平了新途径。