Level splitting in association with the multiphoton Bloch–Siegert shift
Peter L. Hagelstein, Irfan U. Chaudhary
We present a unitary equivalent spin-boson Hamiltonian in which terms can be identified which contribute to the Bloch-Siegert shift, and to the level splittings at the anticrossings associated with the Bloch-Siegert resonances. First-order degenerate perturbation theory is used to develop approximate results in the case of moderate coupling for the level splitting.
arXiv:0709.1961•Journal of Physics B Atomic Molecular and Optical Physics•Jan 24, 2008•19 citations