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首页> 外文期刊>Physical review >Origin of the high-energy kink in the photoemission spectrum of the high-temperature superconductor Bi_2Sr_2CaCu_2O_8
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Origin of the high-energy kink in the photoemission spectrum of the high-temperature superconductor Bi_2Sr_2CaCu_2O_8

机译:高温超导体Bi_2Sr_2CaCu_2O_8的光发射光谱中的高能扭结的起源

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摘要

The high-energy kink or the waterfall effect seen in the photoemission spectra of cuprates is suggestive of the coupling of quasiparticles to a high-energy bosonic mode with implications for the mechanism of superconductivity. Recent experiments, however, indicate that this effect may be an artifact produced entirely by matrix element effects, i.e., by the way the photoemitted electron couples to incident photons in the emission process. In order to address this issue directly, we have carried out realistic computations of the photointensity in Bi_2Sr_2CaCu_2O_8 where the effects of the matrix element are included together with those of the corrections to the self-energy resulting from electronic excitations. Our results demonstrate that while the photoemission matrix element plays an important role in shaping the spectra, the waterfall effect is a clear signature of the presence of strong coupling of quasiparticles to electronic excitations.
机译:在铜酸盐的光发射光谱中看到的高能扭结或瀑布效应暗示了准粒子与高能玻色子模式的耦合,这暗示了超导机制。然而,最近的实验表明,该效应可能是完全由矩阵元素效应产生的伪像,即通过在发射过程中将光发射电子耦合至入射光子的方式。为了直接解决这个问题,我们对Bi_2Sr_2CaCu_2O_8中的光强度进行了实际计算,其中包括了基质元素的影响以及对电子激发产生的自能的校正。我们的结果表明,虽然光发射矩阵元素在塑造光谱中起着重要作用,但瀑布效应是准粒子与电子激发强耦合存在的清晰标志。

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