Display Morehttps://link.aps.org/doi/10.1103/PhysRevB.107.174507
Spectrum of collective excitations of a quantum fluid of polaritons
Abstract
We use a recently developed high-resolution coherent probe spectroscopy method to investigate the dispersion of collective excitations of a polaritonic quantum fluid. We measure the dispersion relation with high energy and wave-number resolution, which allows to determine the speed of sound in the fluid and to evidence the contribution of an excitonic reservoir. We report on the generation of collective excitations at negative energies, on the ghost branch of the dispersion curve. Precursors of dynamical instabilities are also identified. Our methods open the way to the precise study of quantum hydrodynamics of quantum fluids of light.
A Exciton polariton is a photon that is connected to an electron for just a few picoseconds (440 ps referenced in the paper). When that polariton terminates, that connection with the electron is broken and another polariton replaces it in the condensate when energy (pumping) is applied that actions the replacement of the terminated polariton. The condensate that requires input energy to maintain its aggregation of polaritons is called a non equilibrium condensate.
When the polariton terminates, it produces light as its photon is released from the connection with the exciton (electron). The rate at witch these polaritons are replaced is called dispersion.
From the referenced paper as follows:
In this paper, we make use of this technique to perform a detailed
study of the spectrum of collective excitations on both the
normal and ghost branches, and we study the evolution of the
Bogolioubov spectrum along the bistability loop of the fluid,
as the pump parameters are scanned.
The loss of polaritons via dispersion has two branches, a bright or normal branch and a "ghost" branch that serves to account for the negative energy based photons in the condensates photon aggregation.
In Bogoliubov equation (9) that describes the dispersion of the condensate, there are two solutions, one for positive energy photons (bright) and one for negative energy photons (black).
In the EVO, Ken Shoulders identifies two states of the EVO: a bright state and a black state. The EVO can transform itself from the bright state into the black state. This transformation is actions when the dispersion of the condensate moves from the normal branch to the ghost branch where negative energy transforms the EVO into another spacetime condition.
The normal dispersion branch produces visible light, but the ghost branch of the dispersion produces a negative energy vacuum state that results in a new spacetime condition.
Axil, I would heartily recommend you contact the primary author of this paper to communicate your interpretation of her groups work.
You seem to have additional information they are not yet privy to. Rather than posting here, it would be more direct to contact those people better able to understand your work.
Here is her reseachgate page with the contact option:
Please let us know how she responds to your revelations.