Journal
NATURE ELECTRONICS
Volume 3, Issue 5, Pages 267-+Publisher
NATURE RESEARCH
DOI: 10.1038/s41928-020-0414-z
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Funding
- NSF [DMR-1231319]
- NSF CQIS grant [ECCS-1810233]
- ONR MURI [N00014-15-1-2761]
- AFOSR MURI [FA9550-14-1-0389]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- AQT Intelligent Quantum Networks and Technologies (INQNET) research programme
- DOE/HEP QuantISED programme grant
- QCCFP (Quantum Communication Channels for Fundamental Physics) [DE-SC0019219]
- undergraduate overseas internship programme of Nankai University
- National Science Fund for Talent Training in the Basic Sciences [J1103208]
- STC Center for Integrated Quantum Materials
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Acoustic waves are versatile on-chip information carriers that can be used in applications such as microwave filters and transducers. Nonreciprocal devices, in which the transmission of waves is non-symmetric between two ports, are desirable for the manipulation and routing of phonons, but building acoustic non-reciprocal devices is difficult because acoustic systems typically have a linear response. Here, we report non-reciprocal transmission of microwave surface acoustic waves using a nonlinear parity-time symmetric system based on two coupled acoustic resonators in a lithium niobate platform. Owing to the strong piezoelectricity of lithium niobate, we can tune the gain, loss and nonlinearity of the system using electric circuitry. Our approach can achieve 10 dB of non-reciprocal transmission for surface acoustic waves at a frequency of 200 MHz, and we use it to demonstrate a one-way circulation of acoustic waves in cascading non-reciprocal devices.
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