Physics – Condensed Matter
Scientific paper
1997-01-14
Phys. Rev. A 56 (1997) 2056
Physics
Condensed Matter
5 pages, RevTex. Some additional explanations in revision
Scientific paper
10.1103/PhysRevA.56.2056
We study the quantum field theory of light-matter interactions for quantum degenerate atomic gases at low light intensity. We argue that the contact interactions between atoms emerging in the dipole gauge may be ignored. Specifically, they are canceled by concurrent infinite level shifts of the atoms. Our development yields the classic Lorentz-Lorenz local-field shift of the atomic resonance.
Javanainen Juha
Ruostekoski Janne
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