In this talk, I will develop a theoretical framework for anomalous Hall viscosity in altermagnets and propose acoustic protocols for its detection. I will show that its symmetry-allowed tensor structure distinguishes altermagnets from ferromagnets and conventional antiferromagnets, while microscopic calculations reveal a strong sensitivity to gapped Dirac points and Lifshitz transitions. I will then discuss a polarization-resolved acoustic Faraday experiment and identify complementary measurement protocols: one that directly isolates Hall-viscosity-induced mode mixing, and another that exploits elastic anisotropy to enhance the Hall-viscosity contribution through interference with the elastic background, thereby facilitating its experimental detection. These results establish Hall viscosity as both a probe of altermagnetic symmetry and electronic topology and a measurable quantity in GHz ultrasound experiments.
Coffee and cookies will be served 15 minutes before the start of the seminar
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