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Nature paper about mechanical metamaterials violating Betti's theorem
Maybe because I am proud of Betti's theorem being italian, I am curious about this big emphasys on systems violating it. They may "open avenues for energy absorption, conversion and harvesting, soft robotics, prosthetics and optomechanics".... ? I'd be curious to hear some comments. Anyway, the last author Andrea Alu is anyway italian like Betti. And he has been forgotten in the top italian engineers list, so I will add him.
Corentin Coulais, Dimitrios Sounas & Andrea Alù
Suitably engineered mechanical metamaterials show static non-reciprocity—that is, the transmission of motion from one side to the other depends on the direction of that motion.