Theoretical study demonstrates accurate electric dipole polarizabilities across group-IIB elements, highlighting the vital role of relativistic triple excitations and quantum electrodynamics.
We use the perturbed relativistic coupled-cluster (PRCC) theory to compute the electric dipole polarizabilities α of Zn, Cd, and Hg. The computations are done using the Dirac-Coulomb-Breit Hamiltonian with the Uehling potential to incorporate vacuum polarization corrections. To assimilate the self-energy corrections we use the model self-energy operator of Shabaev et al. [Phys. Rev. A 88, 012513 (2013)]. The triple excitations are included perturbatively in the PRCC theory and nonperturbatively in the unperturbed sector. Our results for α for all three elements are in excellent agreement with the experimental data. The other highlight of the results is the orbital energy corrections from Breit interactions. In the literature we could only get the data of Hg [E. Lindroth et al., J. Phys. B 22, 2447 (1989)], which are a near perfect match with our results. We also present the linearized equations of the cluster amplitudes, including the triple excitations, with the angular factors.
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Chattopadhyay et al. (2015) studied this question.
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