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Title: First-Principles Phonon Quasiparticle Theory Applied to a Strongly Anharmonic Halide Perovskite

Journal Article · · Physical Review Letters
ORCiD logo [1];  [2]
  1. National Institute for Materials Science (NIMS), Tsukuba (Japan)
  2. National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States); University of Pittsburgh, PA (United States)

Understanding and predicting lattice dynamics in strongly anharmonic crystals is one of the long-standing challenges in condensed matter physics. Here we propose a first-principles method that gives accurate quasiparticle (QP) peaks of the phonon spectrum with strong anharmonic broadening. On top of the conventional first-order self-consistent phonon (SC1) dynamical matrix, the proposed method incorporates frequency renormalization effects by the bubble self-energy within the QP approximation. We apply the developed methodology to the strongly anharmonic α-CsPbBr3 that displays phonon instability within the harmonic approximation in the whole Brillouin zone. While the SC1 theory significantly underestimates the cubic-to-tetragonal phase transition temperature (Tc) by more than 50%, we show that our approach yields Tc = 404–423 K, in excellent agreement with the experimental value of 403 K. Furthermore, we also demonstrate that an accurate determination of QP peaks is paramount for quantitative prediction and elucidation of phonon linewidth.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
OSTI ID:
2202777
Journal Information:
Physical Review Letters, Vol. 129, Issue 18; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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