Production of cold molecules via magnetically tunable Feshbach resonances

By T. Koehler, K. Góral, P. Julienne. 2006

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Magnetically tunable Feshbach resonances were employed to associate cold diatomic molecules in a series of experiments involving both atomic Bose and two-spin-component Fermi gases. This review illustrates theoretical concepts of both the particular nature of the highly excited Feshbach molecules produced and the techniques for their association from unbound atom pairs. Coupled-channels theory provides a rigorous formulation of the microscopic physics of Feshbach resonances in cold gases. Concepts of dressed versus bare energy states, universal properties of Feshbach molecules, and the classification in terms of entrance- and closed-channel-dominated resonances are introduced on the basis of practical two-channel approaches. Their significance is illustrated for several experimental observations, such as binding energies and lifetimes with respect to collisional relaxation. Molecular association and dissociation are discussed in the context of techniques involving linear magnetic-field sweeps in cold Bose and Fermi gases and pulse sequences leading to Ramsey-type interference fringes. Their descriptions in terms of Landau-Zener, two-level mean-field, as well as beyond mean-field approaches are reviewed in detail, including the associated ranges of validity.

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/8c6eb1feb940b00b170fe523572082b2dae1a9a4

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Citations in the corpus

Creating and probing the Sachdev-Ye-Kitaev model with ultracold gases: Towards experimental studies of quantum gravity (2016, background): “t is known at least that Feshbach molecules of 6Li, which correspond to an electronically ground-state molecular state, can have lifetime as long as 10s in the absence of an optical-lattice potential [72, 73], meaning that its linewidth can be as narrow as Γms ∼ 2π×0.1Hz. As for ΓPA, state-of-art ex”
New frontiers for quantum gases of polar molecules (2016, methodology): “[46] Thorsten Köhler, Krzysztof Góral, and Paul S.”
Observation of an Efimov spectrum in an atomic system (2009, methodology): “We locally fitted the experimental data with equation (2),”
Observation of many-body localization of interacting fermions in a quasirandom optical lattice (2015, methodology): “e resonance) or 198.3G on the molecular side of the resonance. When the Feshbach ﬁeld ramp crosses the resonance, any pairs of atoms on the same lattice site will be converted into Feshbach molecules [54]. Since the molecular transition is out of resonance of the imaging light, we can determine the ”
Universal few-body physics and cluster formation (2017, background): “In ultracold systems the exciting capability to tune two-body atomic scattering length, using magnetic, optical or RF-induced Fano-Feshbach resonances (Chin et al., 2010; Hanna et al., 2010; Inouye et al., 1998; Köhler et al., 2006; Owens et al., 2016; Tscherbul et al., 2010).”
Comparing and contrasting nuclei and cold atomic gases (2013, background): “In atomic gases the diluteness of the system makes the zero-range approximation extremely accurate even around broad Feshbach resonances where the effective range remains small (Köhler et al. 2006) (a more detailed discussion of Feshbach resonances is given in Section 4.1).”
Rotating trapped Bose-Einstein condensates (2008, background): “Thus an applied magnetic field can shift a bound state in a closed channel across the asymptotic continuum in an open channel, leading to a “Feshbach resonance” [see, for example, Moerdijk et al. (1995), Köhler et al. (2006), Sec.”
Cold hybrid ion-atom systems (2017, methodology): “Ultracold atoms can be associated into ultracold diatomic molecules using a laser field via photoassociation (Jones et al., 2006) or using a magnetic field via magnetoassociation (Köhler et al., 2006).”