Design strategy for ferroelectric-based polar metals with dimensionality-tunable electronic states

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2018,（9）
• 页码范围: 69-74
• 页数: 6页
• 语种: 英文

摘要

Since LiOsO3 was discovered,obtaining easy-accessible polar metals for research and applications has been challenging.In this paper,we present a multilayer design strategy,which is configured as ferroelectric layer/carrier reservoir layer/isolation layer/substrate,for obtaining polar metals by electrostatically doping a strained ferroelectric material in a more effective way.In the proposed configuration,both 1 unit-cell thick BaTiO3 and PbTiO3 exhibited considerable Ti off-centering with various strains,which should extend the applicability of ferroelectric-based polar metals in ultra-thin devices.Moreover,engineered by the compressive strain and the BaTiO3 thickness,the design strategy effectively achieved polar metallicity and dimensionality-tunable electronic states associated with the modulation of highly anisotropic properties such as electrical and electronic thermalconductivity,which may be helpful for designing ultra-thin,ultrafast,and low-power switch devices.