6 research outputs found
Relaxation effect and radiative corrections in many-electron atoms
We illuminate the importance of a self-consistent many-body treatment in
calculations of vacuum polarization corrections to the energies of atomic
orbitals in many-electron atoms. Including vacuum polarization in the atomic
Hamiltonian causes a substantial re-adjustment (relaxation) of the
electrostatic self-consistent field. The induced change in the electrostatic
energies is substantial for states with the orbital angular momentum l &;gt;
0. For such orbitals, the relaxation mechanism determines the sign and even
the order of magnitude of the total vacuum polarization correction. This
relaxation mechanism is illustrated with numerical results for the Cs atom
Quantum computing with magnetic atoms in optical lattices of reduced periodicity
We investigate the feasibility of combining Raman optical lattices with a
quantum computing architecture based on lattice-confined magnetically
interacting neutral atoms. A particular advantage of the standing Raman field
lattices comes from reduced interatomic separations leading to increased
interatomic interactions and improved multi-qubit gate performance.
Specifically, we analyze a Zeeman system placed in Raman fields which exhibit periodicity. We find
that the resulting CNOT gate operations times are in the order of millisecond.
We also investigate motional and magnetic-field induced decoherences specific
to the proposed architecture
Marked influence of the nature of chemical bond on CP-violating signature in molecular ions and
Heavy polar molecules offer a great sensitivity to the electron Electric
Dipole Moment(EDM). To guide emerging searches for EDMs with molecular ions, we
estimate the EDM-induced energy corrections for hydrogen halide ions
and in their respective ground states. We find that the energy corrections due to EDM for the two
ions differ by an unexpectedly large factor of fifteen. We demonstrate that a
major part of this enhancement is due to a dissimilarity in the nature of the
chemical bond for the two ions: the bond that is nearly of ionic character in
exhibits predominantly covalent nature in .
We conclude that because of this enhancement the HI ion may be a
potentially competitive candidate for the EDM search.Comment: This manuscript has been accepted for publication in Physical Review
Letters. The paper is now being prepared for publicatio
Effects of confinement on the permanent electric-dipole moment of Xe atoms in liquid Xe
Searches for permanent electric-dipole moments (EDM) of atoms provide
important constraints on competing extensions to the standard model of
elementary particles. Recently proposed experiment with liquid Xe [M.V.
Romalis and M.P. Ledbetter, Phys. Rev. Lett. \textbf{87}, 067601 (2001)] may
significantly improve present limits on the EDMs. To interpret experimental
data in terms of CP-violating sources, one must relate measured atomic EDM to
various model interactions via electronic-structure calculations. Here we study
density dependence of atomic EDMs. The analysis is carried out in the framework
of the cell model of the liquid coupled with relativistic atomic-structure
calculations. We find that compared to an isolated atom, the EDM of an atom of
liquid Xe is suppressed by about 40%