Solid-state physics at the ballistic-to-hydrodynamic crossover. 1) Introduction
Monday, March 26, 2018 - 10:00am - 11:00am
I will describe two complementary ways of thinking about why the 'electron liquid' in metals may, in certain limits, behave as a viscous fluid. 1) Hydrodynamics is the phenomenological effective field theory of the late time dynamics of any thermalizing many-body system, whether classical or quantum, and it may be detected in a quantum system through certain pole structures in real-time correlation functions. 2) Hydrodynamics is the long wavelength limit of kinetic theory, which is a reasonable description of many (but not all) electronic systems in solid-state physics. I will conclude the tutorial by reviewing the recent experimental evidence for the hydrodynamic behavior of electron fluids in ultraclean two-dimensional electronic systems.