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arXiv 1003.0141cond-mat.str-elcond-mat.supr-con
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谱函数定量分析中的电子-声子耦合

Elusive electron-phonon coupling in quantitative analyses of the spectral function

C. N. Veenstra, G. L. Goodvin, M. Berciu, A. Damascelli

备注：
A high-resolution version can be found at http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/KKBF.pdf
发表信息：
Phys. Rev. B 82, 012504 (2010)
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摘要：

我们研究了多种技术提取信息的角度分辨光电子能谱（ARPES）数据，并测试它们对模拟的光谱函数的电子-声子耦合。我们发现，在低耦合制度，它是可能的提取自能和裸带参数通过自洽Kramers-Kronig裸带拟合例程。我们还表明，从重整化的准粒子质量，速度和谱重推导出的有效耦合参数是动量依赖的，在一般情况下，不同于真正的微观耦合，后者是不容易访问的准粒子色散揭示ARPES。

英文摘要：

We examine multiple techniques for extracting information from angle-resolved photoemission spectroscopy (ARPES) data, and test them against simulated spectral functions for electron-phonon coupling. We find that, in the low-coupling regime, it is possible to extract self-energy and bare-band parameters through a self-consistent Kramers-Kronig bare-band fitting routine. We also show that the effective coupling parameters deduced from the renormalization of quasiparticle mass, velocity, and spectral weight are momentum dependent and, in general, distinct from the true microscopic coupling; the latter is thus not readily accessible in the quasiparticle dispersion revealed by ARPES.

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