Analysis of Moiré Phonons in 2D Twisted Bilayers
ORAL
Abstract
Understanding the phonon structure of two-dimensional (2D) twisted bilayers is important both for interpreting experimental
measurements such as Raman scattering and for determining the phonon contribution to exotic phases such as superconductivity. We
have previously developed a continuum model for moiré phonons based on density functional theory calculations of local atomic
configurations. Using this model we analyze the ultrasoft shearing modes related to translations of the moiré pattern. We also
compare and contrast the real-space atomic vibration patterns for aligned (0-degree or 3R) and reversed (180-degree or 2H)
transition metal dichalcogenide bilayers.
measurements such as Raman scattering and for determining the phonon contribution to exotic phases such as superconductivity. We
have previously developed a continuum model for moiré phonons based on density functional theory calculations of local atomic
configurations. Using this model we analyze the ultrasoft shearing modes related to translations of the moiré pattern. We also
compare and contrast the real-space atomic vibration patterns for aligned (0-degree or 3R) and reversed (180-degree or 2H)
transition metal dichalcogenide bilayers.
*NSF Grant No. DMR-1231319NSF Award No. DMR-1922172ARO Award No. W911NF-21-2-0147Simons Foundation, Award No. 896626
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Presenters
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Daniel T Larson
- Harvard University
- Department of Physics, Harvard University