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We perform molecular dynamics simulations to investigate the effect of polarsurfaces on the quality (Q)-factors of zinc oxide (ZnO) nanowire-basednanoresonators. We find that the Q-factors in ZnO nanoresonators with freepolar (0001) surfaces is about one order of magnitude higher than innanoresonators that have been stabilized with reduced charges on the polar(0001) surfaces. From normal mode analysis, we show that the higher Q-factor isdue to a shell-like reconstruction that occurs for the free polar surfaces.This shell-like reconstruction suppresses twisting motion in the nanowires suchthat the mixing of other modes with the resonant mode of oscillation isminimized, and leads to substantially higher Q-factors in the ZnOnanoresonators with free polar surfaces.

Preserving the Q-Factors of ZnO Nanoresonators via Polar Surface Reconstruction