Pays.org January 30, 2023 Researchers in Japan have shown that in a honeycomb phononic crystal composed of metallic nanopillars on a LiNbO3 substrate, the topological surface acoustic wave (SAW) mode inhabits the edge of the honeycomb phononic crystal in spite of the hybridization with the internal acoustic modes of the substrate. Pulse-type microwave impedance microscopy showed gigahertz topological edge mode between two mutually inverted topological phononic crystals. A frequency-dependent image showed that the edge mode evolves as the bulk SAW modes are suppressed owing to the energy gap formation, consistent with the topological nature. According to researchers the realization of a […]
Tag Archives: Phononic crystals
Perfect transmission through barrier using sound
Science Daily December 23, 2020 Tunneling plays an essential role in many branches of physics and has found important applications. It is theoretically proposed that Klein tunneling occurs when, under normal incidence, quasiparticles exhibit unimpeded penetration through potential barriers independent of their height and width. A team of researchers in the US (UC Berkeley, Georgia Institute of Technology, Lawrence Berkeley National Laboratory) created a phononic heterojunction by sandwiching two types of artificial phononic crystals with different Dirac point energies. They demonstrated direct observation of Klein tunneling as shown by the key feature of unity transmission. Their experiment reveals that Klein […]