期刊
SCIENCE
卷 372, 期 6549, 页码 1462-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abe8177
关键词
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资金
- IASH
- Sackler Center for Computational Molecular and Materials Science at Tel Aviv University
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP 0112101001]
- JSPS KAKENHI [JP20H00354]
- CREST [JPMJCR15F3]
- ARO [W911NF-20-1-0013]
- Israel Science Foundation [154/19, 1141/18, 1586/17, 1652/18]
- US-Israel Binational Science Foundation [2016255]
- ISFNSFC [3191/19]
- Naomi Foundation
- Ministry of Science and Technology of Israel [3-16244]
- European Research Council (ERC) under the European Union [852925]
- Israel Ministry of Science and Technology [3-15619]
- European Research Council (ERC) [852925] Funding Source: European Research Council (ERC)
In this study, a stable ferroelectric order was discovered at the interface between two naturally grown flakes of hexagonal boron nitride, where the flakes were stacked in a non-centrosymmetric parallel orientation. Reversible polarization switching coupled with lateral sliding was achieved by scanning a biased tip above the surface.
Despite their partial ionic nature, many-layered diatomic crystals avoid internal electric polarization by forming a centrosymmetric lattice at their optimal van der Waals stacking. Here, we report a stable ferroelectric order emerging at the interface between two naturally grown flakes of hexagonal boron nitride, which are stacked together in a metastable non-centrosymmetric parallel orientation. We observe alternating domains of inverted normal polarization, caused by a lateral shift of one lattice site between the domains. Reversible polarization switching coupled to lateral sliding is achieved by scanning a biased tip above the surface. Our calculations trace the origin of the phenomenon to a subtle interplay between charge redistribution and ionic displacement and provide intuitive insights to explore the interfacial polarization and its distinctive slidetronics switching mechanism.
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