Presentation Information
[11a-A31-3]Anisotropic Mechanical Dissipation Governed by Phonon–Defect Interactions in Single-Crystal Diamond
〇Zhaozong Zhang1, Guo Chen1, Wen Zhao1, Satoshi Koizumi1, Meiyong Liao1 (1.NIMS)
Keywords:
Diamond,MEMS,Energy dissipation
Diamond provides a uniquely pristine platform for probing intrinsic phonon-scattering-induced dissipation. Its ultrawide bandgap effectively suppresses free-carrier effects, while its single-element crystal lattice is free of alloy disorder. Here, we experimentally and theoretically investigate mechan ical energy dissipation in single-crystal diamond with different crystallographic orientations over a broad temperature range from 6 to 900 K using microelectromechanical resonators that enable con trolled modulation of phonon dynamics. We observe a pronounced anisotropy in energy dissipation. Theoretical analysis reveals that the interplay between phonon polarization and defect-induced lat tice distortion governs orientation-dependent phonon–defect interactions, giving rise to anisotropic dissipation. These findings uncover a universal symmetry-governed dissipation mechanism mediated by defect-induced lattice distortions and provide new insight into phonon–spin-center interactions through strain polarization in solid-state quantum systems.