2
votes
1answer
61 views

What is the first paper to report observations of polaritons?

I am seeking references to the first articles regarding the observation of polaritons.
2
votes
0answers
100 views

Phonon-polariton literature resources? [closed]

What is a good resource for studying phonon-polaritons?
10
votes
1answer
451 views

Number density of LO and LA phonons as a function of temperature?

I'd like to know the how the number density of longitudinal optical (LO) and longitudinal acoustic (LA) phonons varies as a function of temperature of the material. Is there a simple expression for ...