Creation of Ultracold<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Molecules in the Electronic Ground State

Stellmer, Simon; Pasquiou, Benjamin; Grimm, Rudolf; Schreck, Florian

doi:10.1103/physrevlett.109.115302

Cited by 118 publications

(125 citation statements)

References 34 publications

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“…Non-resonant light couples to the anisotropic polarizability of an atom pair, shifting the position of shape resonances to lower energies [13] and increasing the resonance's thermal weight in an ultracold trap. Below we demonstrate an enhancement by three orders of magnitude in the photoassociation rate of strontium, a molecule which is currently attracting considerable attention [11,12,14,15]. Photoassociation relies only on the presence of optical transitions which usually are abundant.…”

Section: Introductionmentioning

confidence: 99%

“…This can be changed by applying a strong non-resonant field prior to and during photoassociation. The photoassociation efficiency is determined by the free-bound Franck-Condon overlap between the scattering states and weakly bound excited state levels (purple line), shown here for photoassociation of 88 Sr2 molecules near an intercombination line transition [10][11][12]. For s-waves (grey line, scaled by a factor of 10 6 compared to the blue line), the probability density at short internuclear distances is very small, leading to low photoassociation efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing photoassociation rates by nonresonant-light control of shape resonances

González‐Férez

Koch

2012

Phys. Rev. A

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Photoassociation, assembling molecules from atoms using laser light, is limited by the low density of atom pairs at sufficiently short interatomic separations. Here, we show that non-resonant light with intensities of the order of 10 10 W/cm 2 modifies the thermal cloud of atoms, enhancing the Boltzmann weight of shape resonances and pushing scattering states below the dissociation limit. This leads to an enhancement of photoassociation rates by several orders of magnitude and opens the way to significantly larger numbers of ground state molecules in a thermal ensemble than achieved so far.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing photoassociation rates by nonresonant-light control of shape resonances

González‐Férez

Koch

2012

Phys. Rev. A

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“…In particular the forbidden transition 1 S → 3 P 1 in Sr atom is very appealing for photoassociation experiments and optical manipulation, due its narrow width. This intercombination line has also been used recently for creation of ground state Sr 2 molecules [24,28], and for optical tuning of the Sr scattering length [76][77][78]. We have also found that the states correlated to the Rb( 2 S)+Sr( 3 P ) asymptote might interact with higher excited states, thus we have also explored few of them -namely the states which correlated to Rb( 2 S)+Sr( 3 D) and Rb( 2 D)+Sr( 1 S) asymptotes which are separated only by about 1000 cm −1 .…”

Section: The Ground State Properties Of Rbsrmentioning

confidence: 99%

Ground- and excited-state properties of the polar and paramagnetic RbSr molecule: A comparative study

2014

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This paper deals with the electronic structure of RbSr, a molecule possessing both a permanent magnetic and electric dipole moment in its own frame allowing its manipulation with external fields. Two complementary ab-initio approaches are used for the ground and lowest excited states: first, an approach relying on optimized effective core potentials with core polarization potentials based on a full configuration interaction involving three valence electrons, and second, an approach using a small-size effective core potential with 19 correlated electrons in the framework of coupled-cluster theory. We have found excellent agreement between these two approaches for the ground state properties including the permanent dipole moment. We have focused on studies of excited states correlated to the two lowest asymptotes Rb(5p 2 P )+Sr(5s 2 1 S) and Rb(5s 2 S)+Sr(5s5p 3 P ) relevant for ongoing experiments on quantum degenerate gases. We present also the Hund c) case potential curves obtained using atomic spin-orbit constants. These potential curves are an excellent starting point for experimental studies of molecular structure of RbSr using high-resolution spectroscopy.

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“…Homonuclear Rb 2 molecules in the ground state of a triplet electronic potential were created using the same protocol [48]. In certain molecules, such as Sr 2 , very favorable Franck-Condon factors allow for efficient photoassociation into a deeply-bound state [49,50] or for direct STIRAP from two atoms on individual sites of a 3D lattice [51].…”

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confidence: 99%

New frontiers for quantum gases of polar molecules

et al. 2016

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The field of ultracold quantum matter has burgeoned over the last few decades, thanks to the growing capabilities for atomic systems to be probed and manipulated with exquisite control. Researchers can now precisely create and study quantum manybody states that are effectively isolated from the external environment. Much of the work in ultracold matter has focused on systems of alkali or alkaline-earth atoms, mainly due to their ease of cooling. Extending this precise control to molecules has seen rapidly increasing interest and activity, as molecules possess additional degrees of freedom that make them useful for tests of fundamental physics, studying ultracold chemistry and collisions, and engineering qualitatively new types of quantum phases and quantum many-body systems. Here, we review one particularly fruitful research direction: the creation and manipulation of ultracold bialkali molecules. The recent success in creating a quantum gas of polar molecules opens many exciting research opportunities. Atomic, Molecular, and Optical (AMO) systems offer experimentalists the ability to precisely control interactions in a quantum many-body system [1,2], and a rich set of experiments has already been performed. Some prominent examples include studies of the BEC-BCS crossover in two-component Fermi gases [3,4,5] and the superfluid-Mott insulator transition in ultracold bosons loaded into a 3D optical lattice [6]. Neutral atomic systems normally have point-like contact interactions that can be parametrized with a single quantity, the scattering length a, which can be tuned via a Feshbach resonance [2]. In recent years, systems with long-range and anisotropic interactions have garnered much attention. One natural example is the dipolar interaction between polar molecules, which is the focus of this Review. Of course, many other experimental platforms are also being pursued that feature long-range interactions, including highly magnetic atoms [7,8], trapped ions The dipolar interaction exhibits several important attributes. First, the energy scales in dipolar systems are usually much larger than those in typical atomic alkali systems, making it easier to study interaction-driven structural properties and non-equilibrium dynamics. Second, and perhaps more importantly, the anisotropic and long-range nature of the interaction allows for the realization of novel quantum phases, especially when the spatial dimensions of the system can be varied with optical lattices. Some of these engineered systems may find relevance to outstanding problems in condensed-matter physics [13,14]; moreover, qualitatively new types of physics can emerge in the presence of long-range interactions [15,16,17,18,19,20,21]. As a specific example of a unique feature of long-range interactions, a spin-1/2 Hamiltonian can be encoded based on a pair of oppositeparity rotational states where dipolar interactions give rise to a direct spin exchange coupling between molecules [22,23]. With this scheme implemented in an optical lattice, many-body spin dynam...

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Creation of UltracoldSr2Molecules in the Electronic Ground State

Cited by 118 publications

References 34 publications

Enhancing photoassociation rates by nonresonant-light control of shape resonances

Enhancing photoassociation rates by nonresonant-light control of shape resonances

Ground- and excited-state properties of the polar and paramagnetic RbSr molecule: A comparative study

New frontiers for quantum gases of polar molecules

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