Browsing by Subject "phononic crystals"

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Acoustic Klein tunneling in topological nanoscale phononic crystals
(2022-11) Jahanbani, Shahin; Lai, Keji
The knowledge of emergent many-body phenomena in phononic systems has important implications for our fundamental understanding of the quantum origins of matter as well as technological applications of acoustic devices in quantum acoustics and quantum information processing platforms. In this work, the theoretical foundation for investigating the acoustic version of a many-body phenomenon in nanoscale phononic crystals known as Klein tunneling is presented. The advantage of such an exploration in acoustic systems is that they would provide a natural platform for studying the Dirac pseudospin fields, manifested as acoustic modes in the crystals, with unprecedented details, which is superior to performing experiments at ultra-low-temperatures to explore similar effects in many-body electron systems. The analysis outlined in this work is supplemented with a comprehensive study of the analytic mechanical band structures in topological phononic crystals, along with finite-element modeling of the simulated designs in COMSOL Multiphysics software. Furthermore, the nanoscale-resolution imaging of the transmission mode of Microwave Impedance Microscopy of the propagated acoustic waves in some of the designed phononic crystals will be showcased.