论文标题
在电荷密度 - 波阶段la $ _ {1.65} $ eu $ _ {0.2} $ sr $ _ {0.15}
Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$
论文作者
论文摘要
了解铜酸酯超导体中电荷，列和结构排序趋势之间的相互作用对于揭开其复杂相图至关重要。在（0 0 1）Bragg Peak上使用Cu $ L_3 $和O $ K $共振上的（0 0 1）Bragg Peak上的泵浦探针谐振X射线散射，我们研究了$ q_a = q_a = q_b = 0 $ nematic Order及其与电荷密度波（CDW）订单和Lattice Dynamics的关联的非平衡动力学la $ _ {1.65} $ eu $ _ {0.2} $ sr $ _ {0.15} $ cuo $ _4 $。谐振X射线散射横截面的轨道选择性允许与平面O 2 $ p $和Cu 3 $ d $状态相关的nematicity Dynamics与各向异性晶格扭曲的响应区分开。 CDW平移对称性断裂和列表旋转对称性断裂的直接时间域比较表明，这些破裂的对称性在光激发状态下保持紧密联系，这与所研究的泵浦通风型中CDW拓扑缺陷的稳定性一致。
Understanding the interplay between charge, nematic, and structural ordering tendencies in cuprate superconductors is critical to unraveling their complex phase diagram. Using pump-probe time-resolved resonant x-ray scattering on the (0 0 1) Bragg peak at the Cu $L_3$ and O $K$ resonances, we investigate non-equilibrium dynamics of $Q_a = Q_b = 0$ nematic order and its association with both charge density wave (CDW) order and lattice dynamics in La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$. The orbital selectivity of the resonant x-ray scattering cross-section allows nematicity dynamics associated with the planar O 2$p$ and Cu 3$d$ states to be distinguished from the response of anisotropic lattice distortions. A direct time-domain comparison of CDW translational-symmetry breaking and nematic rotational-symmetry breaking reveals that these broken symmetries remain closely linked in the photoexcited state, consistent with the stability of CDW topological defects in the investigated pump fluence regime.
