Details
| Original language | English |
|---|---|
| Article number | 095106 |
| Journal | Journal of Applied Physics |
| Volume | 125 |
| Issue number | 9 |
| Publication status | Published - 7 Mar 2019 |
Abstract
Topological insulators (TIs) have recently received significant attention due to the promise of lossless transport of various types of energy. Despite this interest, one outstanding issue is that the topological bandgap and the frequencies that are topologically permitted are typically fixed once the topological structure has been designed and fabricated. Therefore, an open and unresolved question concerns the ability to actively tune both the bandgap magnitude, as well as the frequencies, for which the energy is topologically protected. In this work, we report a mechanically tunable phononic TI using an acoustic analog of the quantum valley Hall effect. We propose a phononic crystal comprised of a soft, hyperelastic material where the phononic band structure is modulated through large deformation of the structure. In doing so, space-inversion symmetry can be broken, which leads to a phase transition between two topologically-contrasted states and the emergence of topologically-protected interface modes according to bulk-edge correspondence. We further demonstrate the robustness of this topological protection of the edge state along the interface, which demonstrates that mechanical deformation can be used to effectively tailor and tune the topological properties of elastic structures.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Journal of Applied Physics, Vol. 125, No. 9, 095106, 07.03.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Tunable topological bandgaps and frequencies in a pre-stressed soft phononic crystal
AU - Nguyen, B. H.
AU - Zhuang, Xiaoying
AU - Park, Harold S.
AU - Rabczuk, Timon
N1 - Funding information: B. H. Nguyen and X. Zhuang owe gratitude to the sponsorship from the Sofja Kovalevskaja Programme of Alexander von Humboldt Foundation. H.S.P. acknowledges the support of the Army Research Office (ARO) (Grant No. W911NF-18-1-0380).
PY - 2019/3/7
Y1 - 2019/3/7
N2 - Topological insulators (TIs) have recently received significant attention due to the promise of lossless transport of various types of energy. Despite this interest, one outstanding issue is that the topological bandgap and the frequencies that are topologically permitted are typically fixed once the topological structure has been designed and fabricated. Therefore, an open and unresolved question concerns the ability to actively tune both the bandgap magnitude, as well as the frequencies, for which the energy is topologically protected. In this work, we report a mechanically tunable phononic TI using an acoustic analog of the quantum valley Hall effect. We propose a phononic crystal comprised of a soft, hyperelastic material where the phononic band structure is modulated through large deformation of the structure. In doing so, space-inversion symmetry can be broken, which leads to a phase transition between two topologically-contrasted states and the emergence of topologically-protected interface modes according to bulk-edge correspondence. We further demonstrate the robustness of this topological protection of the edge state along the interface, which demonstrates that mechanical deformation can be used to effectively tailor and tune the topological properties of elastic structures.
AB - Topological insulators (TIs) have recently received significant attention due to the promise of lossless transport of various types of energy. Despite this interest, one outstanding issue is that the topological bandgap and the frequencies that are topologically permitted are typically fixed once the topological structure has been designed and fabricated. Therefore, an open and unresolved question concerns the ability to actively tune both the bandgap magnitude, as well as the frequencies, for which the energy is topologically protected. In this work, we report a mechanically tunable phononic TI using an acoustic analog of the quantum valley Hall effect. We propose a phononic crystal comprised of a soft, hyperelastic material where the phononic band structure is modulated through large deformation of the structure. In doing so, space-inversion symmetry can be broken, which leads to a phase transition between two topologically-contrasted states and the emergence of topologically-protected interface modes according to bulk-edge correspondence. We further demonstrate the robustness of this topological protection of the edge state along the interface, which demonstrates that mechanical deformation can be used to effectively tailor and tune the topological properties of elastic structures.
UR - http://www.scopus.com/inward/record.url?scp=85062717836&partnerID=8YFLogxK
U2 - 10.1063/1.5066088
DO - 10.1063/1.5066088
M3 - Article
AN - SCOPUS:85062717836
VL - 125
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 9
M1 - 095106
ER -