Design of a multifunctional polar metal via first-principles high-throughput structure screening

被引:29
作者
Fang, Yue-Wen [1 ,2 ]
Chen, Hanghui [2 ,3 ]
机构
[1] Kyoto Univ, Dept Mat Sci & Engn, Kyoto, Japan
[2] New York Univ Shanghai, NYU ECNU Inst Phys, Shanghai, Peoples R China
[3] NYU, Dept Phys, 4 Washington Pl, New York, NY 10003 USA
基金
中国国家自然科学基金;
关键词
TOTAL-ENERGY CALCULATIONS; POST-PEROVSKITE; TRANSITION; CRYSTAL; SUBSTRATE; OXIDE;
D O I
10.1038/s43246-019-0005-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Intrinsic polar metals are rare, especially in oxides, because free electrons screen electric fields in a metal and eliminate the internal dipoles that are needed to break inversion symmetry. Here we use first-principles high-throughput structure screening to predict a new polar metal in bulk and thin film forms. After screening more than 1000 different crystal structures, we find that ordered BiPbTi2O6 can crystallize in three polar and metallic structures, which can be transformed between via pressure or strain. In a heterostructure of layered BiPbTi2O6 and PbTiO3, multiple states with different relative orientations of BiPbTi2O6 polar displacements, and PbTiO3 polarization, can be stabilized. At room temperature, the interfacial coupling enables electric fields to first switch PbTiO3 polarization and subsequently drive 180 degrees change of BiPbTi2O6 polar displacements. At low temperatures, the heterostructure provides a tunable tunnelling barrier and might be used in multi-state memory devices. Polar metal oxides are not frequently observed, yet offer attractive properties for functional devices. Now, high-throughput structure screening of a thousand crystal structures reveals that BiPbTi2O6 can form both polar and metallic structures.
引用
收藏
页数:8
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