Visible light absorption of (Fe, C/N) co-doped NaTaO
3
: DFT+
U
Tian Peng-Li
1
, Jiang Zhen-Yi
1
, †
, Zhang Xiao-Dong
1
,
2
, ‡
, Zhou Bo
1
, Dong Ya-Ru
1
, Liu Rui
3
(color online) Band structures of pure NaTaO
calculated by (a) DFT method and (b) DFT+
U
method.