Abstract
We consider a free hydrogen atom composed of a spin-\({\frac{1}{2}}\) nucleus and a spin-\({\frac{1}{2}}\) electron in the standard model of non-relativistic QED. We study the Pauli-Fierz Hamiltonian associated with this system at a fixed total momentum. For small enough values of the fine-structure constant, we prove that the ground state is unique. This result reflects the hyperfine structure of the hydrogen atom ground state.
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Amour, L., Faupin, J. Hyperfine Splitting in Non-relativistic QED: Uniqueness of the Dressed Hydrogen Atom Ground State. Commun. Math. Phys. 319, 425–450 (2013). https://doi.org/10.1007/s00220-012-1625-6
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DOI: https://doi.org/10.1007/s00220-012-1625-6