54 research outputs found
Mixed-field orientation of a thermal ensemble of linear polar molecules
We present a theoretical study of the impact of an electrostatic field
combined with nonresonant linearly polarized laser pulses on the rotational
dynamics of a thermal ensemble of linear molecules. We solve the time-dependent
Schr\"odinger equation within the rigid rotor approximation for several
rotational states. Using the carbonyl sulfide (OCS) molecule as a prototype,
the mixed-field orientation of a thermal sample is analyzed in detail for
experimentally accessible static field strengths and laser pulses. We
demonstrate that for the characteristic field configuration used in current
mixed-field orientation experiments, a significant orientation is obtained for
rotational temperatures below 0.7K or using stronger dc fields.Comment: 9 pages, 10 figure
Impact of Electric Fields on Highly Excited Rovibrational States of Polar Dimers
We study the effect of a strong static homogeneous electric field on the
highly excited rovibrational levels of the LiCs dimer in its electronic ground
state. Our full rovibrational investigation of the system includes the
interaction with the field due to the permanent electric dipole moment and the
polarizability of the molecule. We explore the evolution of the states next to
the dissociation threshold as the field strength is increased. The rotational
and vibrational dynamics are influenced by the field; effects such as
orientation, angular motion hybridization and squeezing of the vibrational
motion are demonstrated and analyzed. The field also induces avoided crossings
causing a strong mixing of the electrically dressed rovibrational states.
Importantly, we show how some of these highly excited levels can be shifted to
the continuum as the field strength is increased, and reversely how two atoms
in the continuum can be brought into a bound state by lowering the electric
field strength.Comment: 10 pages, 4 figure
Observation of Rydberg Blockade Due to the Charge-Dipole Interaction between an Atom and a Polar Molecule
We demonstrate Rydberg blockade due to the charge-dipole interaction between a single Rb atom and a
single RbCs molecule confined in optical tweezers. The molecule is formed by magnetoassociation of a
Rb Ăľ Cs atom pair and subsequently transferred to the rovibrational ground state with an efficiency of
91(1)%. Species-specific tweezers are used to control the separation between the atom and molecule. The
charge-dipole interaction causes blockade of the transition to the Rb(52s) Rydberg state, when the atommolecule
separation is set to 310(40) nm. The observed excitation dynamics are in good agreement with
simulations using calculated interaction potentials. Our results open up the prospect of a hybrid platform
where quantum information is transferred between individually trapped molecules using Rydberg atomsJunta de Andalucia A-FQM-52-UGR20UK Research & Innovation (UKRI)
Engineering & Physical Sciences Research Council (EPSRC) EP/P01058X/1
EP/V047302/1
EP/W00299X/1UK Research and Innovation (UKRI) Frontier Research EP/X023354/1Royal SocietyDurham UniversityMICIN PID2020-113390 GB-I00Junta de Andalucia PY20-00082ERDF-University of Granada A-FQM-52-UGR20Andalusian Research Group FQM-207National Science Foundation (NSF
Fine Structure of Open Shell Diatomic Molecules in Combined Electric and Magnetic Fields
We present a theoretical study of the impact of an electric field combined
with a magnetic field on the rotational dynamics of open shell diatomic
molecules. Within the rigid rotor approximation, we solve the time-independent
Schr\"odinger equation including the fine-structure interactions and the
\Lambda-doubling effects. We consider three sets of molecule specific
parameters and several field regimes and investigate the interplay between the
different interactions identifying the dominant one. The possibility of
inducing couplings between the spin and rotational degrees of freedom is
demonstrated.Comment: 11 pages, 16 figure
Full Control of non-symmetric molecules orientation using weak and moderate electric fields
We investigate the full control over the orientation of a non-symmetric
molecule by using moderate and weak electric fields. Quantum Optimal Control
techniques allow us to orient any axis of 6-chloropyridazine-3-carbonitrile,
which is taken as prototype example here, along the electric field direction.
We perform a detailed analysis by exploring the impact on the molecular
orientation of the time scale and strength of the control field. The underlying
physical phenomena allowing for the control of the orientation are interpreted
in terms of the frequencies contributing to the field-dressed dynamics and to
the driving field by a spectral analysis.Comment: 8 pages and 6 figure
Rydberg optical Feshbach resonances in cold gases
We propose a novel scheme to efficiently tune the scattering length of two
colliding ground-state atoms by off-resonantly coupling the scattering-state to
an excited Rydberg-molecular state using laser light. For the s-wave scattering
of two colliding atoms, we demonstrate that the effective
optical length and pole strength of this Rydberg optical Feshbach resonance can
be tuned over several orders of magnitude, while incoherent processes and
losses are minimised. Given the ubiquity of Rydberg molecular states, this
technique should be generally applicable to homo-nuclear atomic pairs as well
as to atomic mixtures with s-wave (or even p-wave) scattering.Comment: 8 pages, 5 figures. Accepted in Phys. Rev.
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