LaOFeAs表面和体电子结构的解纠缠
Disentangling the surface and bulk electronic structures of LaOFeAs
摘要：
我们进行了全面的角度分辨光电子能谱研究的电子能带结构的LaOFeAs单晶。我们发现，在低温下解理的样品显示出不稳定和高度复杂的能带结构，而在高温下解理的样品显示出稳定和清晰的电子结构。使用\emph{in-situ}表面掺杂K和支持的第一性原理计算，我们确定了表面和体带。我们的分配证实了体和表面状态的温度依赖性的差异。
英文摘要：
We performed a comprehensive angle-resolved photoemission spectroscopy study of the electronic band structure of LaOFeAs single crystals. We found that samples cleaved at low temperature show an unstable and highly complicated band structure, whereas samples cleaved at high temperature exhibit a stable and clearer electronic structure. Using \emph{in-situ} surface doping with K and supported by first-principles calculations, we identify both surface and bulk bands. Our assignments are confirmed by the difference in the temperature dependence of the bulk and surface states.
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