COLD DIPOLAR EXCITON FLUIDS ON A CHIP – FROM MANY-BODY PHYSICS TO MULTI-FUNCTIONAL CIRCUITRY

Cold two-dimensional dipolar fluids are predicted to display a very rich phase diagram and intricate particle correlations in both the classical and quantum regimes, far beyond the well studied weakly interacting gases and are currently a major thrust in modern cold atoms and molecules research.

A dipolar exciton fluid in a semiconductor bilayer is a good system to study such physics directly. Furthermore, these fluids can be transported, controlled, and manipulated over macroscopic distances via their interactions with externally applied potentials, a property that can be utilized for new types of coherent exciton based circuitry on a chip.

I will give an overview of our recent work on dipolar exciton fluids, where we have observed interaction induced particle correlations and a transition from a classical to a quantum many-body fluid, as well as a possible evidence for a sharp macroscopic redistribution with the dark spin states.

I will also present a working multi-functional integrated exciton device, which implements static as well as complex moving external potentials to transport, gate, and route excitonic fluxes over macroscopic distances. This is a proof-of-principle for a building block of an excitonic circuitry.