It's funny how Dr. Kim misspells Ayan Das's name. It's the same mispelling you used in post #12 due to your pedestrian copy, paste, and formatting skills. He doesn't mention polaritons either, which is what the paper is about.
Feel free to contact YE Kim and ask the same question, or even if he has been in contact with me. After all, that’s what I said that your physics boy should have done in the first place, but even you admit he prefers to tussle with pedestrians rather than other physicists. In the meantime, you’ve been proven to be completely wrong, moonboy.