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在散装3R-TMD晶体中，具有相同堆叠顺序的层组显示为三维双胞胎，被双边界的平面隔开。Here, we propose [10] the formation of two-dimensional (2D) electron/hole gases at twin boundaries, analyse their stable density in photo-doped structures, which appears to be in the range of n * ~8x10 12 cm -2 for electrons at both intrinsic mirror twin boundaries in bulk crystals and twisted twin boundaries in structures assembled from two thin mono-domain films.我们还预测了组装双胞胎之间的扭角值的“魔法”值，为此，累积的载体密度，n *和moiré模式之间的可相差性将促进形成强相关的电子状态，例如wigner晶体。参考文献[1] F. Ferreira等，科学报告11，13422（2021）
van der waals ferroelectrics
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