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Title: Core polarization in coupled-cluster theory induced by a parity and time-reversal violating interaction
Authors: Latha, K. V. P
Angom, D
Chaudhuri, R. K
Das, B. P
Mukherjee, D
Keywords: Atomic Physics
Issue Date: Jan-2008
Publisher: Institute of Physics
Citation: J. Phys. B: At. Mol. Opt. Phys. Vol. 41, 035005
Abstract: The effects of a parity and time-reversal violating potential, in particular the tensor–pseudotensor electron–nucleus interaction, are studied. We establish that selected terms representing the interplay of these effects and the residual Coulomb interaction in the coupled-cluster method are equivalent to the coupled-perturbed Hartree–Fock (CPHF). We have shown that the normal CPHF diagrams have a one-to-one correspondence in the coupled-cluster theory, but the CPHF pseudo diagrams are present in a subtle way. We have studied the pseudo diagrams in great detail and have shown explicitly their origin in the coupled-cluster theory. This is demonstrated by considering the case of the permanent electric dipole moment of atomic Hg, and our results are compared with the results of an earlier calculation.
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