The coherent-state transformation in QED-CC theory renormalizes correlation energy and ground state via the mean-field molecular dipole expectation value, using photon-added coherent states and breaking origin invariance for charged molecules.
In con- trast, the low-frequency limit of the renormalized QED- CC approach exhibits a diverging behaviour as zλ ∼ 1 √ ω c 5 for ω c → 0 if ⟨ ˆdλ ⟩0 ̸= 0
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The coherent-state transformation in quantum electrodynamics coupled cluster theory
The coherent-state transformation in QED-CC theory renormalizes correlation energy and ground state via the mean-field molecular dipole expectation value, using photon-added coherent states and breaking origin invariance for charged molecules.