Band widening in graphite
Band widening in graphite
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石墨中的谱带展宽
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
E. L. Shirley
中科院分区：
文献类型：
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作者：
C. Heske;R. Treusch;F. Himpsel;S. Kakar;L. Terminello;H. Weyer;E. L. Shirley
通过对不同结合能的光电子动量分布成像，高精度地确定了石墨的价带宽度。与局域密度泛函理论相比，实验带宽（22.0 eV）被展宽了约11%。准粒子的计算，适当地描述了电子相互作用对固体的激发态的影响，给出了21.8 eV的宽度，在实验和理论的相对不确定度约为1%的实验一致。结果表明，包括最终状态和相关的多体效应到固体的电子结构的理论描述的重要性。
The valence band width of graphite is determined with high accuracy by imaging the momentum distribution of photoelectrons for various binding energies. Compared to local-density-functional theory, the experimental band width (22.0 eV) is stretched by about 11%. Quasiparticle calculations, which properly describe electron interaction effects on the excited states of a solid, give a width of 21.8 eV, in agreement with the experiment within the experimental and theoretical relative uncertainty of about 1%. The results demonstrate the importance of including final-state and associated many-body effects into the theoretical description of the electronic structure of solids.