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We investigated structural instability and polarization of BaTiO3/SrTiO3 superlattice under stress by using first-principles calculation. Our results show that stress induces lattice distortion and charge transfer between Ti atom and O atom. With stress increasing,atomic displacement in BaTiO3/SrTiO3 superlattice grows gradually,resulting in the enhancement of polarization. Furthermore,polarization of superlattice BaTiO3/SrTiO3 can be controlled by changing the stress.
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Keywords:
- lattice distortion /
- stress /
- polarization /
- charge transfer
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