Importance of matrix elements in the ARPES spectra of BISCO
Importance of matrix elements in the ARPES spectra of BISCO
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DOI：
10.1103/physrevlett.83.5154
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发表时间：
1999-12-13
影响因子：
8.6
通讯作者：
Lindroos, M
中科院分区：
文献类型：
--
作者：
Bansil, A;Lindroos, M
我们已经进行了广泛的第一性原理角分辨光强度（ARPES）模拟在Bi 2212，其中的光电发射过程是现实建模考虑到在表面的存在下的初始和最终状态的全晶体波函数。发现与CuO 2平面带相关的ARPES特征的光谱权重随着k（\\）以及入射光子的能量和偏振而经历大的和系统的变化。这些理论预测与相应的测量结果雅阁较好，表明Bi 2212中谱权的显著变化本质上是一种矩阵元效应，在分析高Tc的ARPES谱时应注意矩阵元的重要性。
We have carried out extensive first-principles angle-resolved photointensity (ARPES) simulations in Bi2212 wherein the photoemission process is modeled realistically by taking into account the full crystal wave functions of the initial and final states in the presence of the surface. The spectral weight of the ARPES feature associated with the CuO2 plane bands is found to undergo large and systematic variations with k(\\) as well as the energy and polarization of the incident photons. These theoretical predictions are in good accord with the corresponding measurements, indicating that the remarkable observed changes in the spectral weights in Bi2212 are essentially a matrix element effect and that the importance of matrix elements should be kept in mind in analyzing the ARPES spectra in the high T-c's.