Long-range interactions between polar alkali-metal diatoms in external electric fields

Lepers, Maxence; Véxiau, Romain; Aymar, M; Bouloufa-Maafa, Nadia; Dulieu, Olivier

doi:10.1103/physreva.88.032709

Cited by 41 publications

(64 citation statements)

References 61 publications

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“…Avdeenkov et al [35] have performed an earlier work on that subject for non-lossy molecules, using a non-absorbing repulsive hard wall at short range and no electronic van der Waals interaction between the molecules. Knowing more now on the properties of ground state KRb molecules [36,37], we included an accurate electronic van der Waals coefficient [29], a full loss condition in equation (9) at short range to take into account their chemical reactivity and tested the inclusion of electric quadrupole and octopole moments [30]. We believe our results represent a more quantitative version of the pioneering work of Avdeenkov et al and could be directly compared with experimental measurements.…”

Section: Theoretical Formalismmentioning

confidence: 94%

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Tuning ultracold collisions of excited rotational dipolar molecules

Wang

Quéméner

2015

New J. Phys.

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View the article online for updates and enhancements. Related contentPolar molecule reactive collisions in quasi-1D systems A Simoni, S Srinivasan, J-M Launay et al. AbstractWe investigate the ultracold collisions of rotationally excited dipolar molecules in free-space, taking the hetero-nuclear bi-alkali molecule of KRb as an example. We show that we can sharply tune the elastic, inelastic and reactive rate coefficients of lossy molecular collisions when a second rotationally excited colliding channel crosses the threshold of the initial colliding channel, with the help of an applied electric field, as found by Avdeenkov et al for non-lossy molecules (Phys. Rev. A 73 022707). We can increase or decrease the inelastic and reactive processes whether the second channel is above or below the initial channel. This is seen for both bosonic and fermionic molecules. Additionally, we include the electric quadrupole and octopole moment to the dipole moment in the expression of the long-range multipole-multipole interaction. We found that for processes mediated by the incident channel, such as elastic and reactive collisions, the inclusion of quadrupole and octopole moments is not important at ultralow energies. The moments are important for processes mediated by state-tostate transitions like inelastic collisions.

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Section: Theoretical Formalismmentioning

confidence: 94%

“…The potential energy between two molecules is given by an electronic van der Waals interaction with λ λ λ = + 1 2 . The angular part is given by of Lepers et al [29]. We already have a.u.…”

Section: Theoretical Formalismmentioning

confidence: 99%

Tuning ultracold collisions of excited rotational dipolar molecules

Wang

Quéméner

2015

New J. Phys.

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“…The temperaturedependent rate of close-range encounters is given by β ∝ T=E 3=2 p [42], where E p ∝ ðm 3 NaK C 6 Þ −1=2 is the height of the barrier. For NaK ground state molecules, the C 6 coefficient is dominated by virtual transitions to the nearby rotational states, C 6 ≈ d 4 =ð6BÞ ¼ 5.1ð5Þ × 10 5 a:u: [43,44], with the rotational constant B ¼ 2.83 GHz [45]. For our temperature of T ¼ 500 nK and the barrier height of E p ¼ 12 μK, we find β ≈ 6 × 10 −11 cm −3 =s and, taking the average density ofn ¼ 0.4 × 10 11 cm −3 , a characteristic time scale for the decrease of the total molecule number of 1=ðβnÞ ¼ 0.4 s [46].…”

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confidence: 99%

Ultracold Dipolar Gas of FermionicNa23K40Molecules in Their Absolute Ground State

Park¹,

Will²,

Zwierlein³

2015

Phys. Rev. Lett.

544

548

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We report on the creation of an ultracold dipolar gas of fermionic 23 Na 40 K molecules in their absolute rovibrational and hyperfine ground state. Starting from weakly bound Feshbach molecules, we demonstrate hyperfine resolved two-photon transfer into the singlet X 1 Σ þ jv ¼ 0; J ¼ 0i ground state, coherently bridging a binding energy difference of 0.65 eV via stimulated rapid adiabatic passage. The spin-polarized, nearly quantum degenerate molecular gas displays a lifetime longer than 2.5 s, highlighting NaK's stability against two-body chemical reactions. A homogeneous electric field is applied to induce a dipole moment of up to 0.8 D. With these advances, the exploration of many-body physics with strongly dipolar Fermi gases of 23 Na 40 K molecules is within experimental reach. DOI: 10.1103/PhysRevLett.114.205302 PACS numbers: 67.85.−d, 03.75.Ss, 33.20.−t, 37.10.Mn Quantum gases of dipolar molecules promise to become a platform for precision measurements, quantum information processing, high-speed quantum simulation, and the creation of novel many-body systems [1][2][3]. The long-range, anisotropic nature of electric dipolar interactions between molecules is expected to yield novel types of order, such as topological superfluidity with fermionic molecules [4][5][6], interlayer pairing between two-dimensional systems [7,8], and the formation of dipolar quantum crystals [9]. The necessary prerequisite is the full control over the molecules' translational, electronic, vibrational, rotational, and nuclear spin degrees of freedom [10]. In pioneering work on 40 K 87 Rb and nondipolar 133 Cs 2 , weakly bound molecules were associated from ultracold atoms via Feshbach resonances and were subsequently coherently transferred into the absolute rovibrational ground state via a two-photon stimulated rapid adiabatic passage (STIRAP) [11][12][13][14][15]. Hyperfine control of the KRb molecules was demonstrated using microwave radiation [16]. Ground state KRb molecules are chemically unstable against two-body collisions, as the reaction KRb þ KRb → K 2 þ Rb 2 is energetically allowed. This enabled studies of quantum-state controlled chemical reactions [17,18], but it also led to loss and heating of the trapped molecules. Loading of KRb molecules into optical lattice potentials efficiently suppressed the reactions and enhanced the lifetime of molecular samples [19][20][21].For the study of collisionally dense molecular gases in the quantum regime, molecules that are stable against two-body collisions are of great interest. Possible choices among the alkali-metal dimers were summarized in Ref. [ 2 =ð4πϵ 0 ℏ 2 Þ (m NaK denotes the molecular mass) reaches 0.6 μm, comparable to the interparticle spacing of 1.6 μm for the realized peak densities of n 0 ¼ 2.5 × 10 11 cm −3 . The corresponding dipolar interaction energy E d ¼ d 2 n 0 =ð4πϵ 0 Þ approaches 5% of the local Fermi energy and should therefore dominate the many-body physics of the gas.Our starting point is a gas of about 7 × 10 3 Feshbach molecules of 23 Na 40 K, tr...

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“…Among the various nanomaterials, nanoporous silica exhibits unique properties like high surface area (Bariana et al, 2013), electrical, and thermal conductivity (Lepers et al, 2013;BarberoBarrera et al, 2014) and mechanical stability (Subash et al, 2005). Due to these properties nanoporous silica is used in diverse applications such as memory devices, optics, electronics, biosensors and drug delivery systems.…”

Section: Introductionmentioning

confidence: 97%