• openAccess   Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak 

      Li, Hao-xiang; Rosendo López, María; Zhu, Yi-fan; Fan, Xu-dong; Torrent, Daniel; Liang, Bin; Cheng, Jian-chun; Christensen, Johan American Association for the Advancement of Science (2019)
      Invisibility or unhearability cloaks have beenmade possible by using metamaterials enabling light or sound to flow around obstacle without the trace of reflections or shadows. Metamaterials are known for being flexible ...