Issue |
EPL
Volume 145, Number 2, January 2024
|
|
---|---|---|
Article Number | 26001 | |
Number of page(s) | 6 | |
Section | Condensed matter and materials physics | |
DOI | https://doi.org/10.1209/0295-5075/ad1de9 | |
Published online | 12 February 2024 |
Function phononic crystals
1 Technische Universität Chemnitz, Institut für Physik, Theoretische Physik Simulation neuer Materialien Reichenhainer Str. 70, 09126 Chemnitz, Germany
2 Technische Universität Chemnitz, Center for Microtechnologies (ZfM) - Reichenhainer Str. 70, 09126 Chemnitz, Germany
3 Fraunhofer Institute for Electronic Nano Systems (ENAS) – Technologie - Campus 3, 09126 Chemnitz, Germany
4 Technische Universität Chemnitz, Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN) - Rosenbergstraße 6, 09126 Chemnitz, Germany
Received: 25 October 2023
Accepted: 12 January 2024
We propose a novel type of phononic crystal for which the materials parameters are continuous functions of space coordinates without discontinuities corresponding to a seamless fusion of the constituent materials within the crystal lattice. With the help of an adaptation of this fundamental approach, we extend the well-established concept of phononic crystals, allowing an investigation of the transition from conventional phononic crystals with a regulated step-like parameter function to the realm of so-called function phononic crystals. Our study is based on a first-principle theory assisted by high-performance computer simulations and focuses on an understanding of the effects of a deviation from the typical parameter step function on the phononic density of states (DOS). Our exploration of the DOS reveals a characteristic rapid convergence: even a slight deviation from an ideal step function has the potential to induce radical changes in the band structure leading to the emergence of desirable features, especially multiple complete phononic band gaps.
© 2024 The author(s)
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