论文标题
丘比特超导体中的集体电荷激发和层中跳跃
Gapped collective charge excitations and interlayer hopping in cuprate superconductors
论文作者
论文摘要
我们使用谐振非弹性X射线散射（RIX）来探测电子掺杂的Cuprate超导体SR $ _ {0.9} $ LA $ _ $ _ {0.1} $ CUO $ $ _2 $（SLCO）中等离子体的传播。我们在二维布里鲁因区中心检测到$ \ sim $ 〜120 MeV的等离子差距，表明SLCO中的低能等离子体并非严格存在声学。包括差距在内的等离子体分散剂被分层$ t $ - $ j $ - $ v $型号计算准确捕获。对来自其他丘疹的最新RIX数据进行的类似分析表明，等离子间隙是通用的，其大小与$ t_z $的层间跳的大小有关。我们的工作表示分层铜层中电荷动力学的三维性，并提供了一种确定$ T_Z $的新方法。
We use resonant inelastic x-ray scattering (RIXS) to probe the propagation of plasmons in the electron-doped cuprate superconductor Sr$_{0.9}$La$_{0.1}$CuO$_2$ (SLCO). We detect a plasmon gap of $\sim$~120 meV at the two-dimensional Brillouin zone center, indicating that low-energy plasmons in SLCO are not strictly acoustic. The plasmon dispersion, including the gap, is accurately captured by layered $t$-$J$-$V$ model calculations. A similar analysis performed on recent RIXS data from other cuprates suggests that the plasmon gap is generic and its size is related to the magnitude of the interlayer hopping $t_z$. Our work signifies the three-dimensionality of the charge dynamics in layered cuprates and provides a new method to determine $t_z$.
