论文标题
在过渡金属二盐元中发现库珀对密度波状态
Discovery of a Cooper-Pair Density Wave State in a Transition-Metal Dichalcogenide
论文作者
论文摘要
对密度波（PDW）状态由空间调节超导级参数定义。为了搜索过渡金属二分法中（TMD）中的这种状态，我们使用高速原子分辨率扫描约瑟夫森 - 隧道显微镜（SJTM）。我们检测到一个PDW状态，其电子对密度和能量差距调节在先前存在的电荷密度波（CDW）状态的波频上。 PDW夫妇在S-WAVE超导体和CDW上线性线性，并在边界处表现出与脱节相斜线的相应域，符合Lattice锁定的CODSCDW。然而，我们发现PDW和CDW状态之间的全局$Δφ\ sim \pm2π/3 $相位差，可能是由于Cooper Pair波函数轨道含量。我们的发现在许多其他CDW和超导状态的TMD中，我们的发现Pervasive PDW物理学普遍存在。
Pair density wave (PDW) states are defined by a spatially modulating superconductive order-parameter. To search for such states in transition metal dichalcogenides (TMD) we use high-speed atomic-resolution scanned Josephson-tunneling microscopy (SJTM). We detect a PDW state whose electron-pair density and energy-gap modulate spatially at the wavevectors of the preexisting charge density wave (CDW) state. The PDW couples linearly to both the s-wave superconductor and to the CDW, and exhibits commensurate domains with discommensuration phase-slips at the boundaries, conforming to those of the lattice-locked commensurate CDW. Nevertheless, we find a global $δΦ\sim \pm2π/3$ phase difference between the PDW and CDW states, possibly owing to the Cooper-pair wavefunction orbital content. Our findings presage pervasive PDW physics in the many other TMDs that sustain both CDW and superconducting states.
