• openAccess   Multiple scattering theory of non-Hermitian sonic second-order topological insulators 

      Rosendo López, María; Zhang, Zhiwang; Torrent, Daniel; Christensen, Johan (2019-10-25)
      Topological phases of sound enable unconventional confinement of acoustic energy at the corners in higher-order topological insulators. These unique states which go beyond the conventional bulk-boundary correspondence have ...
    • openAccess   Theory of holey twistsonic media 

      Rosendo López, María; Zhang, Zhiwang; Torrent, Daniel; Christensen, Johan Springer Nature (2022-12-15)
      Rotating two overlapping lattices relative to each other produces the well known moiré interference patterns and has surprisingly led to strongly correlated superconductivity in twisted bilayer graphene. This seminal effect ...
    • 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 ...