We identify a broad class of phonon modes with persistent vortex fluxes at arbitrarily slow propagating velocities in periodic nano-waveguides. Such phonon vortices are associated with the split band-edges in dispersion dependencies, which can be engineered by waveguide design. Modulations introduced in such waveguides can support a pair of defect cavity phonon modes with an arbitrarily small frequency splitting. These features can find applications for sensing and nano-manipulation.
@article{arxiv.1601.07373,
title = {Slow phonon vortices and defect modes in periodic nano-waveguides},
author = {Yue Sun and Anton S. Desyatnikov and Andrey A. Sukhorukov},
journal= {arXiv preprint arXiv:1601.07373},
year = {2016}
}