We show how the snowflake phononic crystal structure, which has been realized experimentally recently, can be turned into a topological insulator for sound waves. This idea, based purely on simple geometrical modifications, could be readily implemented on the nanoscale.
Cite
@article{arxiv.1701.06330,
title = {Snowflake Topological Insulator for Sound Waves},
author = {Christian Brendel and Vittorio Peano and Oskar Painter and Florian Marquardt},
journal= {arXiv preprint arXiv:1701.06330},
year = {2018}
}