Ultracold Dipolar Molecules Composed of Strongly Magnetic Atoms

Frisch, Albert; Mark, Manfred J.; Aikawa, K.; Baier, Simon; Grimm, Rudolf; Petrov, A. N.; Kotochigova, Svetlana; Quéméner, Goulven; Lepers, Maxence; Dulieu, Olivier; Ferlaino, Francesca

doi:10.1103/physrevlett.115.203201

Cited by 105 publications

(120 citation statements)

References 38 publications

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“…Since dipoles can either attract or repel one another, depending on circumstances such as field orientation [6][7][8] and quantum state, electric fields can either enhance or reduce the propensity for the reactant molecules to get close enough to react. This kind of electric field control of kinematics was also demonstrated in the KRb gas [9].…”

Section: Introductionmentioning

confidence: 99%

ShieldingΣ2ultracold dipolar molecular collisions with electric fields

Quéméner

Bohn

2016

Phys. Rev. A

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The prospects for shielding ultracold, paramagnetic, dipolar molecules from inelastic and chemical collisions are investigated. Molecules placed in their first rotationally excited states are found to exhibit effective long-range repulsion for applied electric fields above a certain critical value, as previously shown for non-paramagnetic molecules. This repulsion can safely allow the molecules to scatter while reducing the risk of inelastic or chemically reactive collisions. Several molecular species of 2 Σ molecules of experimental interest -RbSr, SrF, BaF, and YO -are considered, and all are shown to exhibit orders of magnitude suppression in quenching rates in a sufficiently strong laboratory electric field. It is further shown that, for these molecules described by Hund's coupling case b, electronic and nuclear spins play the role of spectator with respect to the shielding.

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Section: Introductionmentioning

confidence: 99%

ShieldingΣ2ultracold dipolar molecular collisions with electric fields

Quéméner

Bohn

2016

Phys. Rev. A

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“…Values with an asterisk ( * ) correspond to sums of experimental Einstein coefficients (see Table IV). (6) ter. This may be due to an underestimated experimental value.…”

Section: B Transition Probabilitiesmentioning

confidence: 99%

Anisotropic optical trapping as a manifestation of the complex electronic structure of ultracold lanthanide atoms: The example of holmium

Wyart

Dulieu

et al. 2017

Phys. Rev. A

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The efficiency of optical trapping is determined by the atomic dynamic dipole polarizability, whose real and imaginary parts are associated with the potential energy and photon-scattering rate respectively. In this article we develop a formalism to calculate analytically the real and imaginary parts of the scalar, vector and tensor polarizabilities of lanthanide atoms. We assume that the sum-over-state formula only comprises transitions involving electrons in the valence orbitals like 6s, 5d, 6p or 7s, while transitions involving 4f core electrons are neglected. Applying this formalism to the ground level of configuration 4f q 6s 2 , we restrict the sum to transitions implying the 4f q 6s6p configuration, which yields polarizabilities depending on two parameters: an effective transition energy and an effective transition dipole moment. Then, by introducing configurationinteraction mixing between 4f q 6s6p and other configurations, we demonstrate that the imaginary part of the scalar, vector and tensor polarizabilities is very sensitive to configuration-interaction coefficients, whereas the real part is not. The magnitude and anisotropy of the photon-scattering rate is thus strongly related to the details of the atomic electronic structure. Those analytical results agree with our detailed electronic-structure calculations of energy levels, Landé g-factors, transition probabilities, polarizabilities and van der Waals C6 coefficients, previously performed on erbium and dysprosium, and presently performed on holmium. Our results show that, although the density of states decreases with increasing q, the configuration interaction between 4f q 6s6p, 4f q−1 5d6s 2 and 4f q−1 5d 2 6s is surprisingly stronger in erbium (q = 12), than in holmium (q = 11), itself stronger than in dysprosium (q = 10).

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“…For molecular systems, however, this can be useful. Indeed, even for magnetic dipolar interaction a molecular gas of erbium might lead to ǫ dd = 1.76 [28,78], which is considerably larger than the ones for the typical atomic magnetic systems discussed above.…”

Section: Experimental Prospectsmentioning

confidence: 83%

Low-lying excitation modes of trapped dipolar Fermi gases: From the collisionless to the hydrodynamic regime

2017

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By means of the Boltzmann-Vlasov kinetic equation we investigate dynamical properties of a trapped, one-component Fermi gas at zero temperature, featuring the anisotropic and long-range dipole-dipole interaction. To this end, we determine an approximate solution by rescaling both space and momentum variables of the equilibrium distribution, thereby obtaining coupled ordinary differential equations for the corresponding scaling parameters. Based on previous results on how the Fermi sphere is deformed in the hydrodynamic regime of a dipolar Fermi gas, we are able to implement the relaxation-time approximation for the collision integral. Then, we proceed by linearizing the equations of motion around the equilibrium in order to study both the frequencies and the damping of the low-lying excitation modes all the way from the collisionless to the hydrodynamic regime. Our theoretical results are expected to be relevant for understanding current experiments with trapped dipolar Fermi gases.

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Ultracold Dipolar Molecules Composed of Strongly Magnetic Atoms

Cited by 105 publications

References 38 publications

ShieldingΣ2ultracold dipolar molecular collisions with electric fields

ShieldingΣ2ultracold dipolar molecular collisions with electric fields

Anisotropic optical trapping as a manifestation of the complex electronic structure of ultracold lanthanide atoms: The example of holmium

Low-lying excitation modes of trapped dipolar Fermi gases: From the collisionless to the hydrodynamic regime

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