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Across-Layer Sliding Ferroelectricity in 2D Heterolayers

机译：Across-Layer Sliding Ferroelectricity in 2D Heterolayers

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摘要

Although the monolayers of most 2D materials are non-ferroelectric withhighly symmetric lattices, symmetry breaking may take place in their bilayersupon some stacking configuration, giving rise to so-called sliding ferroelectricitywhere the vertical polarizations can be electrically reversed viainterlayer translation. However, it is not supposed to appear in systems likegraphene bilayer with centro-symmetry at any stacking configuration, andthe origin of the recently reported ferroelectricity (Nature 2020, 588, 71) ingraphene bilayer intercalated between h-BN remains mysterious. Here, atype of across-layer sliding ferroelectricity that arises from the asymmetry ofnext-neighbor interlayer couplings is proposed. The first-principles evidenceis shown that the vertical polarizations in intercalated centro-symmetric 2Dmaterials like graphene bilayer can be switched via multilayer sliding, whichis likely to be the origin of the observed ferroelectric hysteresis. Moreover,such ferroelectricity may exist in a series of other heterolayers with quasidegeneratepolar states, like graphene bilayer or trilayer on BN substrate, oreven with a molecule layer on surface where each molecule can store 1-bitdata independently, resolving the bottleneck issue of sliding ferroelectricityfor high-density data storage.

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