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1. Non-reciprocal phase transitions

   https://doi.org/10.1038/s41586-021-03375-9  

   Fruchart, Michel ; Hanai, Ryo ; Littlewood, Peter B. ; Vitelli, Vincenzo ( April 2021 , Nature)
2. Fully-Reconfigurable Non-Reciprocal Bandpass Filters

   https://doi.org/10.1109/IMS30576.2020.9224096  

   Simpson, Dakotah ; Psychogiou, Dimitra ( August 2020 , 2020 IEEE/MTT-S International Microwave Symposium (IMS))

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3. RF Co-Designed Non-Reciprocal Bandpass Filters

   https://doi.org/10.1109/APWC52648.2021.9539570  

   Psychogiou, Dimitra ; Ashley, Andrea ( August 2021 , 2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC))
4. Non-reciprocal acoustics in a viscous environment

   https://doi.org/10.1098/rspa.2020.0657  

   Heo, Hyeonu ; Walker, Ezekiel ; Zubov, Yurii ; Shymkiv, Dmitrii ; Wages, Dylan ; Krokhin, Arkadii ; Choi, Tae-Youl ; Neogi, Arup ( December 2020 , Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences)

   null (Ed.)

   It is demonstrated that acoustic transmission through a phononic crystal with anisotropic solid scatterers becomes non-reciprocal if the background fluid is viscous. In an ideal (inviscid) fluid, the transmission along the direction of broken P symmetry is asymmetric. This asymmetry is compatible with reciprocity since time-reversal symmetry ( T symmetry) holds. Viscous losses break T symmetry, adding a non-reciprocal contribution to the transmission coefficient. The non-reciprocal transmission spectra for a phononic crystal of metallic circular cylinders in water are experimentally obtained and analysed. The surfaces of the cylinders were specially processed in order to weakly break P symmetry and increase viscous losses through manipulation of surface features. Subsequently, the non-reciprocal part of transmission is separated from its asymmetric reciprocal part in numerically simulated transmission spectra. The level of non-reciprocity is in agreement with the measure of broken P symmetry. The reported study contradicts commonly accepted opinion that linear dissipation cannot be a reason leading to non-reciprocity. It also opens a way for engineering passive acoustic diodes exploring the natural viscosity of any fluid as a factor leading to non-reciprocity. 

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5. Non-reciprocal electronics based on temporal modulation

   https://doi.org/10.1038/s41928-020-0400-5  

   Nagulu, Aravind ; Reiskarimian, Negar ; Krishnaswamy, Harish ( May 2020 , Nature Electronics)

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