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Berezinskii-Kosterlitz-Thouless phase in two-dimensional ferroelectrics

机译：Berezinskii-Kosterlitz-Thous在二维铁电解中的相位

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摘要

The celebrated Berezinskii-Kosterlitz-Thouless (BKT) phase transition refers to a topological transition characterized, e.g., by the dissociation of vortex-anlivortex pairs in two-dimensional (2D) systems. Such an unusual phase has been reported in various types of materials, but not in the class of systems made by one-unit-cell-thick (1UC) ferroelectrics (also called 2D ferroelectrics). Here, the use of a first-principles-based effective Hamiltonian method leads to the discovery of many fingerprints of a BKT phase existing in between the ferroelectric and paraelectric states of fully relaxed 1UC tin tellurium. Moreover, epitaxial strain is found to have dramatic consequences on the temperature range of such a BKT phase for 1UC SnTe. Consequently, our predictions extend the playground of BKT theory to another class of functional materials, and demonstrate that strain is an effective tool to alter the BKT characteristics there.
机译：庆祝的Berezinskii-Kosterlitz-Thous（BKT）相转变是指以二维（2D）系统中的Vortex-Anlivortex对的解离所表征的拓扑转变。已经在各种类型的材料中报道了这种不寻常的阶段，但不在通过单单元 - 细胞厚（1UC）铁电器（也称为2D铁电）制成的系统类别中。这里，使用基于第一原理的有效汉密尔顿方法的使用导致发现在完全放松的1UC锡碲的铁电和电气状态之间存在的BKT相位的许多指纹。此外，发现外延菌株对1UC SNET的这种BKT相的温度范围具有显着的后果。因此，我们的预测将BKT理论的操场扩展到另一类功能材料，并证明应变是改变那里的BKT特性的有效工具。

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  • 来源
    《Physical review》 |2020年第24期|241402.1-241402.5|共5页
  • 作者

    Changsong Xu; Yousra Nahas; Sergei Prokhorenko; Hongjun Xiang; L. Bellaiche;

  • 作者单位

    Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA;

    Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA;

    Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA;

    Key Laboratory of Computational Physical Sciences (Ministry of Education) State Key Laboratory of Surface Phvsics and Department of Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China;

    Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA;

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