论文标题
放松时标和电子 - 音波耦合在光学泵送YBA $ _2 $ cu $ _3 $ o $ $ _ {6+x} $由时间分辨的拉曼散射显示
Relaxation timescales and electron-phonon coupling in optically-pumped YBa$_2$Cu$_3$O$_{6+x}$ revealed by time-resolved Raman scattering
论文作者
论文摘要
时间解析的测量为由于其不同的时间尺度而在量子材料中解开复杂相互作用的新方法。我们使用泵 - 探针拉曼散射研究YBA $ _2 $ _2 $ cu $ _3 $ o $ $ _ {6+x} $的根尖氧振动。声子种群的时间依赖性表现出强的电子量子耦合。最重要的是，由于费米表面的短暂涂抹，声子在与图形理论的显着一致中转移到了较高的能量。我们还讨论了这些结果随后在较低掺杂时报道的光诱导的超导性的新见解。
Time resolved measurements provide a new way to disentangle complex interactions in quantum materials due to their different timescales. We used pump-probe Raman scattering to investigate the apical oxygen vibration in YBa$_2$Cu$_3$O$_{6+x}$ under nonequilibrium conditions. Time-dependence of the phonon population demonstrated strong electron-phonon coupling. Most importantly, the phonon shifts to a higher energy due to transient smearing of the Fermi surface in a remarkable agreement with diagrammatic theory. We also discuss new insights into photoinduced superconductivity reported at lower doping that follow from these results.
