A one-way system for sound

'Acoustic rectifier' is a diode for sound waves.

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Liang, B., Yuan, B. & Cheng, J. C. Phys. Rev. Lett. 103, 104301 (2009).
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Liang, B., Guo, X. S., Tu, J., Zhang, D. & Cheng, J. C. Nature Mater. advance online publication doi:10.1038/NMAT2881 (2010).

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Daniel Cressey
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Cressey, D. A one-way system for sound. Nature (2010). https://doi.org/10.1038/news.2010.559