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[求助] density of states (DOS)

谢毅院士课题组的文章Ultrathin TiO2 flakes optimizing solar light driven CO2 reduction中出现了计算态密度,本人完全对计算方面不懂,所以看不懂,有人能说一下这张图怎么理解吗?原文描述为As revealed by the density-functional-theory (DFT) calculations in Fig. 1(A) and (B), the ultrathin TiO2 flake exhibits obviously enhanced density of states (DOS) at the conduction band edge as compared to its bulk counterpart (as represented by red arrow in
figure), which could be further demonstrated by the corresponding distribution of charge density in Fig. 1(C) and (D). This specifies that more carriers can be efficiently transferred to the conduction band edge of the atomically thin TiO2 flakes.

(1)怎么从图1中ab图看出ultrathin TiO2态密度增大;ab图是怎么做出来的?
(2)cd图如何理解?


看到另外一篇文章也有相似计算,如图2,看不懂,能解释下吗?文章为Angew. Chem. 2016, 128, 6828 –6832  
Enhanced Photoexcited Carrier Separation in Oxygen-Doped ZnIn2S4 Nanosheets for Hydrogen Evolution

两篇原文见附件。density of states (DOS)
1.png


density of states (DOS)-1
2.png
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