畸变kagome化合物RhPb中的声子鼓面表面态
Phononic drumhead surface state in distorted kagome compound RhPb
AI总结：
本研究通过单晶X射线衍射证实RhPb由理想kagome结构畸变为$P\ar{6}2m$相，并揭示其体相声子平带、Dirac节线及(100)表面的鼓面表面态。
摘要：
RhPb最初被认为是具有$P6/mmm$对称性的CoSn型化合物之一，包含由d区元素原子构成的理想kagome晶格。然而，理论计算预测其会出现声子软模，导致kagome晶格畸变，并稳定为具有$P\ar{6}2m$对称性的结构[A. Ptok等人，Phys. Rev. B 104, 054305 (2021)]。本文给出了支持这一预测的单晶X射线衍射结果。此外，我们讨论了具有$P\ar{6}2m$对称性的RhPb的主要动力学性质。其体相声子色散曲线包含若干平带、Dirac节线以及三重简并Dirac点。因此，在以Pb蜂窝亚晶格的锯齿形边缘为终端的(100)表面上实现了声子鼓面表面态。
英文摘要：
RhPb was initially recognized as one of a CoSn-like compounds with $P6/mmm$ symmetry, containing an ideal kagome lattice of $d$-block atoms. However, theoretical calculations predict the realization of the phonon soft mode which leads to the kagome lattice distortion and stabilization of the structure with $P\bar{6}2m$ symmetry [A. Ptok et al., Phys. Rev. B 104, 054305 (2021)]. Here, we present the single crystal x-ray diffraction results supporting this prediction. Furthermore, we discuss the main dynamical properties of RhPb with $P\bar{6}2m$ symmetry. The bulk phononic dispersion curves contain several flattened bands, Dirac nodal lines, and triple degenerate Dirac points. As a consequence, the phononic drumhead surface state is realized for the (100) surface, terminated by the zigzag-like edge of Pb honeycomb sublattice.
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