Permanent dipole moment of LiCs in the ground state

Deiglmayr, Johannes; Grochola, A.; Repp, M.; Dulieu, Olivier; Wester, Roland; Weidemüller, Matthias

doi:10.1103/physreva.82.032503

Cited by 46 publications

(39 citation statements)

References 21 publications

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“…We also point out possible promising applications of the system to quantum information processing. Since ultracold ground-state polar alkali-metal dimers are already available in experiments [12][13][14][15][16][17] and are even loaded in optical lattices [14], we expect our results to be immediately applicable to current experiments.…”

Section: Introductionmentioning

confidence: 88%

“…Due to the relative simplicity of their production, the only ultracold polar molecules currently available in their electronic, vibrational, and rotational ground states are alkali-metal dimers KRb [12][13][14][15] and LiCs [16,17]. Therefore, we focus on the hyperfine structure of alkali-metal dimers, which has recently been studied theoretically [18][19][20][21][22] and experimentally [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Quantum magnetism with polar alkali-metal dimers

et al. 2011

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We show that dipolar interactions between ultracold polar alkali-metal dimers in optical lattices can be used to realize a highly tunable generalization of the t-J model, which we refer to as the t-J -V -W model. The model features long-range spin-spin interactions J z and J ⊥ of XXZ type, long-range density-density interaction V , and long-range density-spin interaction W , all of which can be controlled in both magnitude and sign independently of each other and of the tunneling t. The "spin" is encoded in the rotational degree of freedom of the molecules, while the interactions are controlled by applied static electric and continuous-wave microwave fields. Furthermore, we show that nuclear spins of the molecules can be used to implement an additional (orbital) degree of freedom that is coupled to the original rotational degree of freedom in a tunable way. The presented system is expected to exhibit exotic physics and to provide insights into strongly correlated phenomena in condensed-matter systems. Realistic experimental imperfections are discussed.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Quantum magnetism with polar alkali-metal dimers

et al. 2011

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“…As a sim ple rule, the requirem ents for observing long-range interactions in an ultracold gas are large dipole m om ent, low tem perature, and high m olecular density [3], For alkali-m etal dim ers in the electronic ground state, LiCs has the largest perm anent electric dipole m om ent o f 5.5 D [ 14,15] decreasing to 2.72 D for NaK [16], 1.3 D for RbCs [17], and only 0.57 D for KRb [3]. Zuchow ski and H utson [18] discuss the selection o f the m ost appropriate m olecule ensem ble from the point o f view o f chem ical stability.…”

Section: Introductionmentioning

confidence: 99%

Molecular beam study of thea3Σ+state of NaK up to the dissociation limit

et al. 2015

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We provide spectroscopic data for the a 3E+ state of the 23Na39K molecule. The experiment is done in an ultrasonic beam apparatus, starting from the ground state X 'E + and driving the population to the a 3S + state, using a A scheme with fixed pump and scanning dump laser. The signals are observed as dips of the total fluorescence. The intermediate level is chosen to be strongly perturbed by the B 1 n / c 3E + states mixing to overcome the singlet-triplet transfer prohibition. We observed highly resolved hyperfine spectra of various rovibrational levels of the a 3E + state from va = 2 up to the highest vibrational levels for rotational quantum numbers Na = 4,6,8. By the typical experimental linewidth of 17 MHz, the vibrational dependence of the hyperfine splitting is clearly revealed for NaK. The absolute frequency measurements of the vibrational levels are used for improvement of the a 'E + potential curve and of the derived scattering length of all natural isotope combinations. Applying the A scheme in the reverse direction can provide a pathway for efficient transfer of ultracold 23Na39K molecules from the Na(3s) 4-K(4s) asymptote to the lowest levels of the ground state. We show spectra that couple the absolute ground state Vx = 0. J = 0 with an appropriate intermediate state for direct realization of the reverse path. The refined theoretical model of the coupled excited states of the Na(3s) + K(4p) asymptote allows predictions of efficient paths for 23Na4(,K; one example is calculated.

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“…FRs are used for the creation of deeply bound molecules via Feshbach association [2,3] followed by stimulated Raman adiabatic passage [4][5][6], which gives access to the study of many-body physics, quantum chemistry and precision measurements [7,8]. With a permanent electric dipole moment of 5.5 Debye [9,10], the largest among all alkali-metal dimers, a system of LiCs molecules in their energetically lowest states [11] is considered to be an excellent candidate for the investigation of dipolar quantum gases [12]. Another application of the precise tunability close to a FR is the study of Efimov trimers [13].…”

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confidence: 99%

Observation of interspecies6Li-133Cs Feshbach resonances

et al. 2013

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We report on the observation of nineteen interspecies Feshbach resonances in an optically trapped ultracold Bose-Fermi mixture of 133 Cs and 6 Li in the two energetically lowest spin states. We assign the resonances to s-and p-wave molecular channels by a coupled-channels calculation, resulting in an accurate determination of LiCs ground state potentials. Fits of the resonance position based on the undressed Asymptotic Bound State model do not provide the same level of accuracy as the coupled-channels calculation. Several broad s-wave resonances provide prospects to create fermionic LiCs molecules with a large dipole moment via Feshbach association followed by stimulated Raman passage. Two of the s-wave resonances overlap with a zero crossing of the Cs scattering length which offers prospects for the investigation of polarons in an ultracold Li-Cs mixture. [4][5][6], which gives access to the study of many-body physics, quantum chemistry and precision measurements [7,8]. With a permanent electric dipole moment of 5.5 Debye [9,10], the largest among all alkali-metal dimers, a system of LiCs molecules in their energetically lowest states [11] is considered to be an excellent candidate for the investigation of dipolar quantum gases [12]. Another application of the precise tunability close to a FR is the study of Efimov trimers [13]. The large mass ratio of m Cs /m Li = 22 results in an advantageous universal scaling factor of 4.88 instead of 22.7 as found for a system of equal masses [14], resulting in excellent conditions for observing a series of several Efimov resonances, which, so far, has not been achieved. Interspecies FR can be also used to control the interaction between an impurity and a Bose-Einstein Condensate (BEC). Such a system can directly be mapped to the Fröhlich polaron Hamiltonian [15][16][17], which describes the interaction of an electron gas with the charged lattice atoms in a crystal. As the excitations in a Bose-Einstein condensate represent the lattice phonons, a FR allows the precise adjustment of the modeled phonon-electron coupling strength α, thus allowing one to explore fundamental solid-state systems.FRs between different alkaline species have been identified for a variety of Bose-Bose [18][19][20][21] Cs were studied by means of thermalization measurements at zero magnetic field [40], however, the tunability of the interspecies scattering properties via tuning the magnetic field has yet remained unexplored. Here, we report on the observation of nineteen interspecies loss features in different spin channels of an optically trapped 6 Li -133 Cs mixture, by scanning a homogeneous magnetic field (Feshbach spectroscopy). The magnetic field positions and widths of the observed FRs are analyzed in a full coupled-channels calculation, allowing a consistent assignment of the resonances.We have realized an all-optical preparation scheme to simultaneously trap an ultracold 6 Li -133 Cs mixture with a magnetic field control up to 1300 G by sequentially transferring Li and Cs atoms into an optic...

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Permanent dipole moment of LiCs in the ground state

Cited by 46 publications

References 21 publications

Quantum magnetism with polar alkali-metal dimers

Quantum magnetism with polar alkali-metal dimers

Molecular beam study of thea3Σ+state of NaK up to the dissociation limit

Observation of interspecies6Li-133Cs Feshbach resonances

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