Floquet topological insulators for sound

The unique conduction properties of condensed matter systems with topological order have recently inspired a quest for the similar effects in classical wave phenomena. Acoustic topological insulators, in particular, hold the promise to revolutionize our ability to control sound, allowing for large isolation in the bulk and broadband one-way transport along their edges, with topological immunity against structural defects and disorder. So far, these fascinating properties have been obtained relying on moving media, which may introduce noise and absorption losses, hindering the practical potential of topological acoustics. Here we overcome these limitations by modulating in time the acoustic properties of a…

• NS
  National Science Foundation

  Award: 1537932
• DT
  Defense Threat Reduction Agency

  Awards: HDTRA1-12-, HDTRA1, HDTRA1-12-1-0022
• DO
  Division of Civil, Mechanical and Manufacturing Innovation
• AF
  Air Force Office of Scientific Research

  Awards: FA9550-, FA9550-14-1-0105, FA9550, FA9550-13-1-0204