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Title: Phononic drumhead surface state in the distorted kagome compound RhPb

Journal Article · · Physical Review Research
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [5]
  1. Polish Academy of Sciences (PAS), Krakow (Poland)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Univ. of Basel (Switzerland)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. Max Planck Institute of Solid State Research, Stuttgart (Germany); Jagiellonian Univ., Krakow (Poland)

RhPb was initially recognized as one of 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 $$P$$$\bar6$$$$2m$ symmetry [A. Ptok et al., Phys. Rev. B 104, 054305 (2021)]. Here, we present the single crystal x-ray diffraction results supporting this prediction. Furthermore, we discuss the main dynamical properties of RhPb with $$P$$$\bar6$$$$2m$ symmetry, i.e. phonon dispersions and surface Green’s functions using the modern theoretical methods based on density functional theory. 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 zigzaglike edge of Pb honeycomb sublattice.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2279799
Alternate ID(s):
OSTI ID: 2305799
Journal Information:
Physical Review Research, Vol. 5, Issue 4; ISSN 2643-1564
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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