562 research outputs found
Ultracold giant polyatomic Rydberg molecules: coherent control of molecular orientation
We predict the existence of a class of ultracold giant molecules formed from
trapped ultracold Rydberg atoms and polar molecules. The interaction which
leads to the formation of such molecules is the anisotropic charge-dipole
interaction (). We show that prominent candidate molecules such as KRb
and deuterated hydroxyl (OD) should bind to Rydberg rubidium atoms, with
energies GHz at distances m. These
molecules form in double wells, mimicking chiral molecules, with each well
containing a particular dipole orientation. We prepare a set of correlated
dressed electron-dipole eigenstates which are used in a resonant Raman scheme
to coherently control the dipole orientation and to create cat-like entangled
states of the polar molecule.Comment: 4 pages, 4 figure
Green's Functions and the Adiabatic Hyperspherical Method
We address the few-body problem using the adiabatic hyperspherical
representation. A general form for the hyperangular Green's function in
-dimensions is derived. The resulting Lippmann-Schwinger equation is solved
for the case of three-particles with s-wave zero-range interactions. Identical
particle symmetry is incorporated in a general and intuitive way. Complete
semi-analytic expressions for the nonadiabatic channel couplings are derived.
Finally, a model to describe the atom-loss due to three-body recombination for
a three-component fermi-gas of Li atoms is presented.Comment: 14 pages, 8 figures, 2 table
Ultralong-range polyatomic Rydberg molecules formed by a polar perturber
The internal electric field of a Rydberg atom electron can bind a polar
molecule to form a giant ultralong-range stable polyatomic molecule. Such
molecules not only share their properties with Rydberg atoms, they possess huge
permanent electric dipole moments and in addition allow for coherent control of
the polar molecule orientation. In this work, we include additional Rydberg
manifolds which couple to the nearly degenerate set of Rydberg states employed
in [S. T. Rittenhouse and H. R. Sadeghpour, Phys. Rev. Lett. 104, 243002
(2010)]. The coupling of a set of Rydberg states with the
nearly degenerate Rydberg manifolds in alkali metal atoms leads to pronounced
avoided crossings in the Born-Oppenheimer potentials. Ultimately, these avoided
crossings enable the formation of the giant polyatomic Rydberg molecules with
standard two-photon laser photoassociation techniques.Comment: 7 pages, 4 figure
Observation of blue-shifted ultralong-range Cs Rydberg molecules
We observe ultralong-range blue-shifted Cs molecular states near
Rydberg states in an optical dipole trap, where .
The accidental near degeneracy of and Rydberg states for in
Cs, due to the small fractional quantum defect, leads to non-adiabatic
coupling among these states, producing potential wells above the
thresholds. Two important consequences of admixing high angular momentum states
with states are the formation of large permanent dipole moments, Debye, and accessibility of these states via two-photon association.
The observed states are in excellent agreement with theory. Both projections of
the total angular momentum on the internuclear axis are visible in the
experiment
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