Effect of linear density of states on the quasiparticle dynamics and small electron-phonon coupling in graphite
Effect of linear density of states on the quasiparticle dynamics and small electron-phonon coupling in graphite
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DOI：
10.1103/physrevlett.100.016802
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发表时间：
2008-01-11
影响因子：
8.6
通讯作者：
Kim, C.
中科院分区：
文献类型：
--
作者：
Leem, C. S.;Kim, B. J.;Kim, C.
我们使用角分辨光电子能谱获得了非常高质量的天然石墨单晶的光谱函数。观察到非键合带和键合带的明显分离以及不对称的线形。有限的光电子逃逸深度和能带结构很好地解释了不对称的线形状。在 K 点附近提取的光谱函数宽度（光孔寿命的倒数）超出最大声子能量，大约与费米能量附近的态线密度所预期的能量成正比。电子-声子耦合常数的上限约为0.2，比之前报道的值小得多。
We obtained the spectral function of very high quality natural graphite single crystals using angle-resolved photoelectron spectroscopy. A clear separation of nonbonding and bonding bands and asymmetric lineshape are observed. The asymmetric line shapes are well accounted for by the finite photoelectron escape depth and the band structure. The extracted width of the spectral function (inverse of the photohole life time) near the K point is, beyond the maximum phonon energy, approximately proportional to the energy as expected from the linear density of states near the Fermi energy. The upper bound for the electron-phonon coupling constant is about 0.2, a much smaller value than the previously reported one.