Electric controlling of surface metal-insulator transition in the doped BaTiO3 film
Wei Xun,
Xiang Hao,
Tao Pan,
Jia-Lin Zhong,
Chun-Lan Ma,
Fang Hou,
Yin-Zhong Wu
Affiliations
Wei Xun
Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, and School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China
Xiang Hao
Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, and School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China
Tao Pan
Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, and School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China
Jia-Lin Zhong
School of Electronic and Information Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Chun-Lan Ma
Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, and School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China
Fang Hou
Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, and School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China
Yin-Zhong Wu
Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, and School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China
Based on first-principles calculations, the BaTiO3(BTO) film with local La-doping is studied. For a selected concentration and position of doping, the surface metal-insulator transition occurs under the applied electric field, and the domain appears near the surface for both bipolar states. Furthermore, for the insulated surface state, i.e., the downward polarization state in the doped film, the gradient bandgap structure is achieved, which favors the absorption of solar energy. Our investigation can provide an alternative avenue in modification of surface property and surface screening effect in polar materials.
