铁电性
材料科学
凝聚态物理
超晶格
多铁性
双层
压电
电介质
纳米技术
光电子学
物理
复合材料
膜
遗传学
生物
出处
期刊:ACS Nano
[American Chemical Society]
日期:2017-06-11
卷期号:11 (6): 6382-6388
被引量:393
标识
DOI:10.1021/acsnano.7b02756
摘要
Vertical ferroelectricity in two-dimensional (2D) materials is desirable for high-density data storage without quantum tunneling or high power consumption/dissipation, which still remains elusive due to the surface-depolarizing field. Herein, we report the first-principles evidence of 2D vertical ferroelectricity induced by interlayer translation, which exists extensively in the graphitic bilayer of BN, AlN, ZnO, MoS2, GaSe, etc.; the bilayer of some 2D ferromagnets like MXene, VS2, and MoN2 can be even multiferroics with switchable magnetizations upon ferroelectric switching, rendering efficient reading and writing for high-density data storage. In particular, the electromechanical coupling between interlayer translation and potential can be used to drive the flow of electrons as nanogenerators for harvesting energy from human activities, ocean waves, mechanical vibration, etc. A ferroelectric superlattice with spatial varying potential can be formed in a bilayer Moire pattern upon a small twist or strain, making it possible to generate periodic n/p doped-domains and shape the periodicity of the potential energy landscape. Finally, some of their multilayer counterparts with wurtzite structures like a ZnO multilayer are revealed to exhibit another type of vertical ferroelectricity with greatly enhanced polarizations.
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