Direct observation of Klein tunneling in phononic crystals

Xue Jiang, Chengzhi Shi, Zhenglu Li, Siqi Wang, Yuan Wang, Sui Yang, Steven G. Louie, Xiang Zhang

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


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. We created a phononic heterojunction by sandwiching two types of artificial phononic crystals with different Dirac point energies. The direct observation of Klein tunneling as shown by the key feature of unity transmission is demonstrated. Our experiment reveals that Klein tunneling occurs over a broad band of acoustic frequency. The direct observation of Klein tunneling in phononic crystals could find applications in signal processing, supercollimated beams, and communications.
Original languageEnglish (US)
Pages (from-to)1447-1450
Number of pages4
Issue number6523
StatePublished - Dec 18 2020
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-06-07
Acknowledged KAUST grant number(s): OSR-2016-CRG5-2996
Acknowledgements: This work was supported by the Gordon and Betty Moore Foundation (award no. 5722), the King Abdullah University of Science and Technology (KAUST Office of Sponsored Research award no. OSR-2016-CRG5-2996), the National Natural Science Foundation of China (grant no. 11904055), and the Young Elite Scientists Sponsorship Program by CAST. Z.L. and S.G.L. acknowledge support from the National Science Foundation (grant no. DMR-1926004).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.


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