Quantitative analysis of Sr 2 RuO 4 angle-resolved photoemission spectra: Many-body interactions in a model Fermi liquid
Quantitative analysis of Sr 2 RuO 4 angle-resolved photoemission spectra: Many-body interactions in a model Fermi liquid
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DOI：
10.1103/physrevb.72.205114
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发表时间：
2005-08
影响因子：
3.7
通讯作者：
N. Ingle;K. Shen;F. Baumberger;W. Meevasana;D. Lu;Z. Shen;A. Damascelli;S. Nakatsuji;Z. Mao;Y. Maeno;T. Kimura;Y. Tokura
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文献类型：
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作者：
N. Ingle;K. Shen;F. Baumberger;W. Meevasana;D. Lu;Z. Shen;A. Damascelli;S. Nakatsuji;Z. Mao;Y. Maeno;T. Kimura;Y. Tokura
角分辨光发射光谱（ARPES）光谱包含了相关材料中多体相互作用的丰富信息。然而，对ARPES光谱进行定量分析，以一致的方式提取各种耦合参数是极具挑战性的，即使对于模型费米液体系统也是如此。我们提出了一种拟合程序，可以定量地获得相关二维材料${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$的本征线形，能量和动量分解效应的反卷积。在相关二维材料中，我们发现其ARPES线宽小于其结合能，这是费米液体理论中准粒子的一个关键特性。我们还发现，当电子-电子散射分量与电子-声子和杂质散射项分离时，随着费米能量的接近，它以与费米液体理论相容的函数形式减小。结合先前确定的费米表面，这些结果通过ARPES给出了费米液体系统的完整图像。此外，我们还表明，提取的自能虚部的大小与直流输运测量结果非常吻合。
Angle-resolved photoemission spectroscopy (ARPES) spectra hold a wealth of information about the many-body interactions in a correlated material. However, the quantitative analysis of ARPES spectra to extract the various coupling parameters in a consistent manner is extremely challenging, even for a model Fermi liquid system. We propose a fitting procedure which allows quantitative access to the intrinsic line shape, deconvolved of energy and momentum resolution effects, of the correlated two-dimensional material ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$. In correlated two-dimensional materials, we find an ARPES linewidth that is narrower than its binding energy, a key property of quasiparticles within Fermi liquid theory. We also find that when the electron-electron scattering component is separated from the electron-phonon and impurity scattering terms, it decreases with a functional form compatible with Fermi liquid theory as the Fermi energy is approached. In combination with the previously determined Fermi surface, these results give a complete picture of a Fermi liquid system via ARPES. Furthermore, we show that the magnitude of the extracted imaginary part of the self-energy is in remarkable agreement with DC transport measurements.