Building on our recent demonstration of non-equilibrium BEC of exciton polaritons with an amorphous polymer at room temperature , we are creating photonic potential landscapes for polariton condensates by harnessing novel nanostructured, tunable cavity arrays .
Furthermore, the same platform allows us to make use of colloidal semiconductor nanoplatelets and perovskite nanocrystals to reach into the regime of strong interactions.
These new classes of materials implement the ideal compromise between high overall oscillator strength and strong exciton confinement, while at the same time offering advanced assembly options that allow us to form regular arrays.
These experiments could enable access to strongly correlated phenomena such as a quantum phase transition to a Mott insulator [7,8], which has been elusive to polariton systems up to now.
The polariton condensate appears as a nonlinearly growing peak in the momentum distribution, corresponding to the macroscopic population of the state.
Interference fringes in a Michelson interferometer are a signature of the long-range spatial coherence.
Pinned vortices result in fork-like dislocations.
Wavelength-scale Gaussian-shaped deformation
The pattern on the left is achieved by focused ion beam milling into the substrate.
Atomic force microscopy (center) reveals the smooth Gaussian structure on the top mirror substrate.
By mounting both halves of the optical microcavity on XYZ-nanopositioners, we create tunable polaritons in the external potential given by the nanostructure.