While we understand well how two classical dipoles interact with each other, the problem becomes much more complex and interesting when we put many dipoles together and form a dipolar fluid, especially when collective quantum effects become important. A dipolar exciton fluid in a semiconductor bilayer is a wonderful system to look for the very rich quantum-collective physics that is theoretically predicted for ultra-cold dipoles. Furthermore, these exciton fluids can be utilized for new types of circuitry on a chip.
I will give an overview of the recent research highlights on dipolar exciton fluids, with many new exciting observations such as a transition from a classical to a quantum correlated fluid, evidences for a macroscopic formation of an incompressible dark liquid, as well as observations of very long spin lifetimes. I will also present some proof-of-principle experiments of building blocks for a complex excitonic circuitry and of the ability to form dipolar molecules with out-of-plane interactions.