Elusive electron-phonon coupling in quantitative spectral function analyses
Elusive electron-phonon coupling in quantitative spectral function analyses
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定量谱函数分析中难以捉摸的电子声子耦合
DOI：
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发表时间：
2010
期刊：
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通讯作者：
A. Damascelli
中科院分区：
文献类型：
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作者：
C. Veenstra;G. Goodvin;M. Berciu;A. Damascelli
我们研究了从角度分辨光电子能谱(ARPES)数据中提取信息的多种技术，并针对电子-声子耦合的模拟光谱函数对它们进行了测试。我们发现，在低耦合区域，可以通过自洽的Kramers-Kronig裸带拟合例程来提取自能和裸带参数。我们还表明，由准粒子质量、速度和谱重重整化得到的有效耦合参数是动量相关的，通常不同于真正的微观耦合；因此，后者在ARPES揭示的准粒子色散中是不容易获得的。
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.