Editorial: Quo vadis, cold molecules?

Doyle, John M.; Friedrich, Břetislav; Krems, Roman V.; Masnou-Seeuws, F.

doi:10.1140/epjd/e2004-00151-x

Cited by 436 publications

(405 citation statements)

References 156 publications

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“…The interest to study interactions in ultracold molecular gases [1] is propelling various research programs to produce and trap dense ultracold molecular ensembles [2,3,4,5,6,7]. The goals and perspectives in this field range from quantum computation [8] and quantum scattering [9] to ultrahigh precision spectroscopy [10] and coherent ultracold chemistry [11].…”

Section: Introductionmentioning

confidence: 99%

Coherent control with shaped femtosecond laser pulses applied to ultracold molecules

et al. 2006

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We report on coherent control of excitation processes of translationally ultracold rubidium dimers in a magneto-optical trap by using shaped femtosecond laser pulses. Evolution strategies are applied in a feedback loop in order to optimize the photoexcitation of the Rb2 molecules, which subsequently undergo ionization or fragmentation. A superior performance of the resulting pulses compared to unshaped pulses of the same pulse energy is obtained by distributing the energy among specific spectral components. The demonstration of coherent control to ultracold ensembles opens a path to actively influence fundamental photo-induced processes in molecular quantum gases.

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Section: Introductionmentioning

confidence: 99%

Coherent control with shaped femtosecond laser pulses applied to ultracold molecules

et al. 2006

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“…Currently, the creation of ultracold heteronuclear ground state molecules poses one of the major experimental challenges in the field of ultracold physics [1]. The trapping of ultracold ground state molecules with large phase space density promises to allow an exciting array of novel research lines to be studied.…”

mentioning

confidence: 99%

Low-energy resonances and bound states of aligned bosonic and fermionic dipoles

Kanjilal

Blume

2008

Phys. Rev. A

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The low-energy scattering properties of two aligned identical bosonic and identical fermionic dipoles are analyzed. Generalized scattering lengths are determined as functions of the dipole moment and the scattering energy. Near resonance, where a new bound state is being pulled in, all non-vanishing generalized scattering lengths diverge, with the a 00 and a 11 scattering lengths being dominant for identical bosons and identical fermions, respectively, near both broad and narrow resonances. Implications for the energy spectrum and the eigenfunctions of trapped two-dipole systems and for pseudo-potential treatments are discussed. PACS numbers: 34.10.+x Currently, the creation of ultracold heteronuclear ground state molecules poses one of the major experimental challenges in the field of ultracold physics [1]. The trapping of ultracold ground state molecules with large phase space density promises to allow an exciting array of novel research lines to be studied. Although the largest phase space density of ultracold ground state molecules achieved to date is still fairly small, a number of promising cooling schemes have been demonstrated [2]. Thus, it is expected that degenerate molecular gases with large electric dipole moment will be created in the laboratory in the near future. Polar molecules are a candidate for qubits in quantum computing [3] and may be used in high precision measurements that aim at placing yet stricter limits on the electric dipole moment of the electron [4]. Furthermore, dipolar gases are predicted to show roton-like features [5] and to exhibit rich stability diagrams whose details depend on the trapping geometry [6]. The stability of dipolar atomic Cr condensates has recently been investigated experimentally. To enhance the anisotropic effects, which are due to Cr's magnetic dipole moment, the s-wave scattering length was tuned to zero by applying an external field in the vicinity of a Fano-Feshbach resonance [7].To create and then utilize ultracold molecules, it is mandatory to develop a detailed understanding of the scattering properties of two interacting dipoles in free space and in a trap. Unlike the interaction between s-wave alkali atoms, the interaction between two dipoles is long-range and angledependent. A two-dipole system can, e.g., be realized experimentally by loading an optical lattice with either two or zero dipoles per site. If the optical lattice is sufficiently deep and if the interaction between nearest and next to nearest neighbors are absent or negligible, then each optical lattice site can be treated as an independent approximately harmonic trap. This paper determines the scattering properties of two aligned dipoles, either identical bosons or identical fermions, as functions of the dipole moment and the scattering energy. In general, the dipoles can either be magnetic or electric. For concreteness, we restrict our discussion in the following to the scattering between molecular electric dipoles. Sequences of scattering resonances, which can be classified as "broad...

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“…Being able to perform experiments with ultracold dense polar molecular gases is one of the outstanding challenges in atomic, molecular and optical physics [135]. The increasing interest in this problem is motivated by a wide range of of research directions which would directly benefit from the availability of such molecular samples.…”

Section: Ultracold Heteronuclear Molecules In a 3d Optical Latticementioning

confidence: 99%

Heteronuclear quantum gas mixtures

Ospelkaus¹,

Ospelkaus²

2008

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. In this PhD tutorial article, we present experiments with quantum degenerate mixtures of fermionic and bosonic atoms in 3-dimensional optical lattices. This heteronuclear quantum gas mixture offers a wide range of possibilities for quantum simulation, implementation of condensed matter Hamiltonians, quantum chemistry and ultimately dense and quantum degenerate dipolar molecular samples.We When loaded into a 3D optical lattice, a whole zoo of novel quantum phases has been predicted for Fermi-Bose mixtures. We present the first realization of Fermi-Bose mixtures in 3D optical lattices as a novel quantum many body system [3]. We study the phase coherence of the bosonic cloud in the 3D optical lattice as a function of the amount of fermionic atoms simultaneously trapped in the lattice. We observe a loss of phase coherence at much lower lattice depth than for a pure bosonic cloud and discuss possible theoretical scenarios including adiabatic processes, mean field FermiBose Hubbard scenarios, and disorder-enhanced localization scenarios.After considering this many-body limit of mixtures in lattices, we show how fermionic heteronuclear Feshbach molecules can be created in the optical lattice [4] as a crucial step towards all ground state dense dipolar molecular samples. We develop rf association as a novel molecule association technique, measure the binding energy, lifetime, and association efficiency of the molecules. We develop a simple theoretical single channel model of the molecules trapped in the lattice [5] which gives excellent quantitative agreement with the experimental data.

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Editorial: Quo vadis, cold molecules?

Cited by 436 publications

References 156 publications

Coherent control with shaped femtosecond laser pulses applied to ultracold molecules

Coherent control with shaped femtosecond laser pulses applied to ultracold molecules

Low-energy resonances and bound states of aligned bosonic and fermionic dipoles

Heteronuclear quantum gas mixtures

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