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arXiv · 2403.11813

Combining intrinsic and sliding-induced polarizations for multistates in two dimensional ferroelectrics

Chuhan Tang·Zhiqiang Tian·Tao Ouyang·Anlian Pan·Mingxing Chen
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Abstract

Going beyond the bistability paradigm of the charge polarizations in ferroelectrics is highly desired for ferroelectric (FE) memory devices toward ultra-high-density information storage. Here, we propose to build multistates by combining the intrinsic and sliding-induced polarizations. The physics is that there is at least one order of magnitude difference in the energy barriers between these two types of polarization, which leads to a significant difference in the electric fields for reversing the polarization. This difference, along with the symmetry breaking, allows for a unique flipping mechanism involving layer-by-layer sliding followed by layer-by-layer flipping during the transformation of the multistates. As a result, six and ten switchable states can be achieved for the 1T" bilayers and trilayers, respectively. We further illustrate the concept in H-stacking bilayers and trilayers of 1T" transition-metal dichalcogenides by first-principles calculations. Our study provides a new route to design novel polarization states for developing next-generation memory devices.

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Chuhan Tang, Zhiqiang Tian, Tao Ouyang, Anlian Pan, Mingxing Chen. 2024-03-18. Combining intrinsic and sliding-induced polarizations for multistates in two dimensional ferroelectrics. https://doi.org/10.1103/physrevb.111.l081407

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