【摘要】 报道了纤锌矿WZ(wurtzite)GaN(0 0 0 1)表面的电子结构研究 .采用全势线性缀加平面波方法计算得到了GaN分波态密度 ,与以前实验结果一致 .讨论了Ga3d对GaN电子结构的影响 .利用同步辐射角分辨光电子能谱技术研究了价带电子结构 .通过改变光子能量的垂直出射谱勾画沿ΓA方向的体能带结构 ,与计算得到的能带结构符合得较好 .根据沿ΓK和ΓM方向的非垂直出射谱 ,确定了两个表面态的能带色散更多还原

【Abstract】 An electronic structure investigation on GaN(0001) is reported. We employ a full potential linearized augmented plane wave(FPLAPW) approach to calculate the partial density of states, which is in agreement with previous experimental results. The effects of the Ga3d semicore levels on the electronic structure of GaN are discussed. The valence electronic structure of the wurtzite GaN(0001) surface is investigated using synchrotron radiation excited angle resolved photoemission spectroscopy. The bulk bands dispersion along ΓA direction in the Brillouin zones is measured using normal emission spectra by changing photon energy. The band structure derived from our experimental data is compared well with the results of our FPLAPW calculation. Furthermore, off normal emission spectra are also measured along the ΓK and ΓM directions. Two surface states are identified, and their dispersions are characterized.更多还原