Page 05/13/2016 10:11:27

Paper accepted by Physical Review Applied

‚ÄčTopological insulators have aroused interest in the study of one-way propagation edge state. In many cases the topological transition occurs when the time-reversal symmetry is broken and is not tunable.  In this paper, a design of phononic crystal is proposed. It supports topological transition that can be tuned by varying the geometric size and/or the strength of an external velocity field.  The results are universal and may expand our ability to tailor acoustic waves.