Speaker
Description
We introduce the concept of emergent Hall viscosity in condensed matter systems whose effective field theories incorporate strain-induced emergent vielbein, metric, and gauge fields. This framework provides a unified description of previously studied contributions, which we term electronic and geometric Hall viscosities, and naturally allows for additional mixed terms. As a concrete example, we analyze graphene-like systems subjected to a magnetic field in the integer quantum Hall regime as well as the non-relativistic limit of their Semenoff-type massive semiconducting phase. We present a Green function representation of the emergent Hall viscosity and examine its topological robustness. Within this setting, we propose an experimental protocol based on twisted bilayer graphene to disentangle the different viscosity contributions.