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arXiv 1001.0573cond-mat.supr-con
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高温超导体玻色子模的时间分辨谱函数理论

Theory of time-resolved spectral function in high-temperature superconductors with bosonic modes

Jianmin Tao, Jian-Xin Zhu

摘要:

我们发展了一个三温度模型来模拟具有强各向异性电子-声子耦合的高温超导体中电子和声子温度随时间的变化。该模型不仅考虑了紧束缚能带结构,而且在超导态下也是成立的。在此基础上,我们利用双时间格林函数计算了时间分辨谱函数。我们发现,dip-hump结构的演变与时间延迟。更有趣的是,当声子被激光场激发时,得到了新的声子结构。这种特征可以作为电子振动模式耦合的直接证据。

英文摘要:

We develop a three-temperature model to simulate the time dependence of electron and phonon temperatures in high-temperature superconductors displaying strong anistropic electron-phonon coupling. This model not only takes the tight-binding band structure into account, but also is valid in superconducting state. Based on this model, we calculate the time-resolved spectral function via the double-time Green's functions. We find that the dip-hump structure evolves with the time delay. More interestingly, new phononic structures are obtained when the phonons are excited by a laser field. This signature may serve as a direct evidence for electron-vibration mode coupling.

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