论文标题
光谱证据证明了通过库酸酯中的量子波动熔化的电荷顺序熔化的证据
Spectroscopic Evidence for Charge Order Melting via Quantum Fluctuations in a Cuprate
论文作者
论文摘要
铜氧化物高的TC超导体具有与超导性共存或近端的许多外来阶，其量子波动可能解释了正常状态的异常行为，甚至影响超导性。然而，关于这种量子波动的光谱证据仍然难以捉摸。在这里，我们使用谐振非弹性X射线散射（RIX）揭示了与电荷顺序（CO）相关的这种波动（CO）相关的波动指纹（CO）。在超导状态下，虽然准弹性CO信号随温度的降低，但CO波动与键伸展的声子之间的相互作用以狂热的干扰形式矛盾地增加，与竞争订单的期望不符。我们援引一般原则，认为这种行为反映了在秩序量子量临界点附近的耗散系统的性质，在降低量子量临界点附近，耗散随着伪模的开放和低温下的超导间隙而变化，从而导致量子量的量子临界波动的增殖，从而融合了CO。
Copper-oxide high TC superconductors possess a number of exotic orders co-existing with or proximal to superconductivity, whose quantum fluctuations may account for the unusual behaviors of the normal state, even affecting superconductivity. Yet, spectroscopic evidence about such quantum fluctuations remains elusive. Here, we reveal spectroscopic fingerprints for such fluctuations associated with a charge order (CO) in nearly optimally-doped Bi2Sr2CaCu2O8+d, using resonant inelastic x-ray scattering (RIXS). In the superconducting state, while the quasi-elastic CO signal decreases with temperature, the interplay between CO fluctuations and bond-stretching phonons in the form of a Fano-like interference paradoxically increases, incompatible with expectations for competing orders. Invoking general principles, we argue that this behavior reflects the properties of a dissipative system near an order-disorder quantum critical point, where the dissipation varies with the opening of the pseudogap and superconducting gap at low temperatures, leading to the proliferation of quantum critical fluctuations which melt CO.
