TY - JOUR
T1 - Strong excitonic interactions in the oxygen K-edge of perovskite oxides
AU - Tomita, Kota
AU - Miyata, Tomohiro
AU - Olovsson, Weine
AU - Mizoguchi, Teruyasu
N1 - Funding Information:
This study was supported by the Mitsubishi Science Foundation (27143) and Grant-in-Aids for Scientific Research from MEXT (Nos. 25106003, 26630302, and 26249092). T.M. (Miyata) was supported by a Grant-in-Aid from the Japan Society for the Promotion of Science Fellows (No. 155500000176). W.O. acknowledges the support from LiLi-NFM and the Swedish Research Council (VR) Grant no. 621-2011-4426.
Funding Information:
This study was supported by the Mitsubishi Science Foundation ( 27143 ) and Grant-in-Aids for Scientific Research from MEXT (Nos. 25106003 , 26630302 , and 26249092 ). T.M. (Miyata) was supported by a Grant-in-Aid from the Japan Society for the Promotion of Science Fellows (No. 155500000176 ). W.O. acknowledges the support from LiLi-NFM and the Swedish Research Council (VR) Grant no. 621-2011-4426 .
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - Excitonic interactions of the oxygen K-edge electron energy-loss near-edge structure (ELNES) of perovskite oxides, CaTiO 3 , SrTiO 3 , and BaTiO 3 , together with reference oxides, MgO, CaO, SrO, BaO, and TiO 2 , were investigated using a first-principles Bethe–Salpeter equation calculation. Although the transition energy of oxygen K-edge is high, strong excitonic interactions were present in the oxygen K-edge ELNES of the perovskite oxides, whereas the excitonic interactions were negligible in the oxygen K-edge ELNES of the reference compounds. Detailed investigation of the electronic structure suggests that the strong excitonic interaction in the oxygen K-edge ELNES of the perovskite oxides is caused by the directionally confined, low-dimensional electronic structure at the Ti–O–Ti bonds.
AB - Excitonic interactions of the oxygen K-edge electron energy-loss near-edge structure (ELNES) of perovskite oxides, CaTiO 3 , SrTiO 3 , and BaTiO 3 , together with reference oxides, MgO, CaO, SrO, BaO, and TiO 2 , were investigated using a first-principles Bethe–Salpeter equation calculation. Although the transition energy of oxygen K-edge is high, strong excitonic interactions were present in the oxygen K-edge ELNES of the perovskite oxides, whereas the excitonic interactions were negligible in the oxygen K-edge ELNES of the reference compounds. Detailed investigation of the electronic structure suggests that the strong excitonic interaction in the oxygen K-edge ELNES of the perovskite oxides is caused by the directionally confined, low-dimensional electronic structure at the Ti–O–Ti bonds.
KW - Electron energy-loss near-edge structure
KW - Exciton
KW - First principles calculation
KW - Oxygen K-edge
KW - Perovskite oxides
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U2 - 10.1016/j.ultramic.2016.04.006
DO - 10.1016/j.ultramic.2016.04.006
M3 - Article
C2 - 27106633
AN - SCOPUS:84963804629
SN - 0304-3991
VL - 178
SP - 105
EP - 111
JO - Ultramicroscopy
JF - Ultramicroscopy
ER -