非公度调制范德华超晶格中的条纹电子相
Striped electronic phases in an incommensurately modulated van der Waals superlattice
AI总结：
本文报道体相范德华超晶格 SrTa$_2$S$_5$ 中非公度一维调制诱导的条纹电子相，发现各向异性输运和层间相干受抑的非常规超导，并归因于条纹结构孕育的一维配对密度波。
摘要：
晶体的电子性质可以通过空间周期性调制来调控。长波长、非公度调制尤其引人关注，近期以莫尔图案化的范德华（vdW）异质结为代表。包含干净二维层之间界面的体相范德华超晶格是范德华异质结的可扩展体相类似物，为探索非公度调制的二维态提供了一个互补平台。在此，我们报道了体相范德华超晶格 SrTa$_2$S$_5$，它实现了二维过渡金属二硫属化物（TMD）$H$-TaS$_2$ 层的非公度一维调制。量子振荡证明 $H$-TaS$_2$ 层中存在高质量电子输运，该输运因调制而变得各向异性，并表现出类似于光刻调制二维体系的公度振荡。我们还在 SrTa$_2$S$_5$ 中发现了非常规的干净极限超导电性（SC），其层间相干性相对于层内相干性受到显著抑制。这种层级结构可能源于相邻超导层中空间排列不匹配的配对密度波（PDW）超导。通过考察层间临界电流密度 $J_c$ 对面内磁场 $H_{ab}$ 的依赖关系，我们发现其相对于 $H_{ab}$ 方向具有各向异性：当 $H_{ab}$ 垂直于条纹时 $J_c$ 最大（最小），当 $H_{ab}$ 平行于条纹时 $J_c$ 最小（最大），这与一维 PDW 超导一致。通过衍射，我们发现结构调制在相邻 $H$-TaS$_2$ 层之间发生位移，表明不匹配的一维 PDW 由条纹结构所孕育。凭借相干调制结构中的高迁移率费米液体，SrTa$_2$S$_5$ 是研究干净条纹金属和超导体中预期新现象的有前景的载体。更广泛地说，SrTa$_2$S$_5$ 确立了体相范德华超晶格作为宏观平台，以回应关于调制电子相的长期预测。
英文摘要：
Electronic properties of crystals can be manipulated using spatially periodic modulations. Long-wavelength, incommensurate modulations are of particular interest, exemplified recently by moiré patterned van der Waals (vdW) heterostructures. Bulk vdW superlattices hosting interfaces between clean 2D layers represent scalable bulk analogs of vdW heterostructures and present a complementary venue to explore incommensurately modulated 2D states. Here we report the bulk vdW superlattice SrTa$_2$S$_5$ realizing an incommensurate 1D modulation of 2D transition metal dichalcogenide (TMD) $H$-TaS$_2$ layers. High-quality electronic transport in the $H$-TaS$_2$ layers, evidenced by quantum oscillations, is made anisotropic by the modulation and shows commensurability oscillations akin to lithographically modulated 2D systems. We also find unconventional, clean-limit superconductivity (SC) in SrTa$_2$S$_5$ with a pronounced suppression of interlayer coherence relative to intralayer coherence. Such a hierarchy can arise from pair-density wave (PDW) SC with mismatched spatial arrangement in adjacent superconducting layers. Examining the in-plane magnetic field $H_{ab}$ dependence of interlayer critical current density $J_c$, we find anisotropy with respect to $H_{ab}$ orientation: $J_c$ is maximized (minimized) when $H_{ab}$ is perpendicular (parallel) to the stripes, consistent with 1D PDW SC. From diffraction we find the structural modulation is shifted between adjacent $H$-TaS$_2$ layers, suggesting mismatched 1D PDW is seeded by the striped structure. With a high-mobility Fermi liquid in a coherently modulated structure, SrTa$_2$S$_5$ is a promising host for novel phenomena anticipated in clean, striped metals and superconductors. More broadly, SrTa$_2$S$_5$ establishes bulk vdW superlattices as macroscopic platforms to address long-standing predictions for modulated electronic phases.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
