Chiral Hydrodynamics: From active matter to quantum Hall fluids
Our understanding of the universal phenomenon in many-body systems ranging from subatomic to astronomical scales relies largely on the hydrodynamical framework. Thus the discovery of new hydrodynamic effect opens new understanding in a multitude of physical systems. Such a new hydrodynamical effect recently has come from Quantum Hall Effect (QHE), where Avron, Seiler, and Zograf showed that the viscosity of QH fluid is purely dissipation-less and is the off-diagonal component of the total viscosity tensor, dubbed `odd' or `Hall' viscosity. It turns out that odd viscosity is not limited to QH, but a special symmetry allowed term of a parity broken system in two dimensions. In this talk, I will outline several fascinating fluid phenomena induced by odd viscosity term such as "odd" torque, "odd" surface waves and "odd" bubbles and discuss their applicability in a wide class of systems ranging from chiral active matter to fractional quantum Hall effect.