Observation of a Feshbach Resonance in Cold Atom Scattering

Courteille, Ph. W.; Freeland, R. S.; Heinzen, D. J.; Abeelen, F. A. van; Verhaar, B.J.

doi:10.1103/physrevlett.81.69

Cited by 477 publications

(246 citation statements)

References 25 publications

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“…For example, for systems interacting additively through Lenard-Jones potentials with well depth ǫ and length scale σ the coupling constant g is directly proportional to the atom mass, g = 4mǫσ 2 / 2 . As alluded to in the introduction, the coupling strength can be varied experimentally via a Feshbach resonance [30,31]. Although a full description of a Feshbach resonance requires the coupling between at least two channels-in tritium, e.g., of the singlet and triplet potential curves (coupled through a long-range hyperfine Hamiltonian) [10,32]-, some properties can be described within a single channel model.…”

Section: A Many-body Hamiltonianmentioning

confidence: 99%

Energetics and structural properties of three-dimensional bosonic clusters near threshold

Hanna

Blume

2006

Phys. Rev. A

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We treat three-dimensional bosonic clusters with up to N = 40 atoms, interacting additively through two-body Van der Waals potentials, in the near-threshold regime. Our study includes super-borromean systems with N atoms for which all subsystems are unbound. We determine the energetics and structural properties such as the expectation value of the interparticle distance as a function of the coupling strength. It has been shown that the coupling strength g (N) *

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Section: A Many-body Hamiltonianmentioning

confidence: 99%

Energetics and structural properties of three-dimensional bosonic clusters near threshold

Hanna

Blume

2006

Phys. Rev. A

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“…The study of ultracold quantum gases is interlinked with controlling magnetic Fano-Feshbach resonances and thereby changing the effective interparticle interaction by many orders of magnitudes [1][2][3][4][5]. This makes ultracold Fermi gases a convenient tool to study the behavior of a degenerate fermionic many-body system [6] over a wide range of interaction strengths, in particular fermionic superfluidity [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Correlations in the low-density Fermi gas: Fermi-liquid state, dimerization, and Bardeen-Cooper-Schrieffer pairing

et al. 2015

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We present ground state calculations for low-density Fermi gases described by two model interactions, an attractive square-well potential and a Lennard-Jones potential, of varying strength. We use the optimized Fermi-Hypernetted Chain integral equation method which has been proved to provide, in the density regimes of interest here, an accuracy better than one percent. We first examine the low-density expansion of the energy and compare with the exact answer by Huang and Yang (H. Huang and C. N. Yang, Phys. Rev. 105, 767 (1957)). It is shown that a locally correlated wave function of the Jastrow-Feenberg type does not recover the quadratic term in the expansion of the energy in powers of a0kF, where a0 is the vacuum s-wave scattering length and kF the Fermi wave number. The problem is cured by adding second-order perturbation corrections in a correlated basis. Going to higher densities and/or more strongly coupled systems, we encounter an instability of the normal state of the system which is characterized by a divergence of the in-medium scattering length. We interpret this divergence as a phonon-exchange driven dimerization of the system, similar to what one has at zero density when the vacuum scattering length a0 diverges. We then study, in the stable regime, the superfluid gap and its dependence on the density and the interaction strength. We identify two different corrections to low-density expansions: One is medium corrections to the pairing interaction, and the other one finite-range corrections. We show that the most important finite-range corrections are a direct manifestation of the many-body nature of the system.

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“…With dipole traps the trapping parameters are independent of externally applied magnetic fields. This property made possible the first observations of Feshbach resonances (29,30). It was shown that evaporative cooling was possible in dipole traps (31) and efforts were made to reach BEC in all-optical traps (31), but the original densities were too low.…”

Section: Advantages Of Optical Trapping and Cooling Techniquesmentioning

confidence: 93%

Design for an optical cw atom laser

Ashkin¹

2004

Proc. Natl. Acad. Sci. U.S.A.

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A new type of optical cw atom laser design is proposed that should operate at high intensity and high coherence and possibly record low temperatures. It is based on an ''optical-shepherd'' technique, in which far-off-resonance blue-detuned swept sheet laser beams are used to make new types of high-density traps, atom waveguides, and other components for achieving very efficient Bose-Einstein condensation and cw atom laser operation. A shepherd-enhanced trap is proposed that should be superior to conventional magneto-optic traps for the initial collection of molassescooled atoms. A type of dark-spot optical trap is devised that can cool large numbers of atoms to polarization-gradient temperatures at densities limited only by three-body collisional loss. A scheme is designed to use shepherd beams to capture and recycle essentially all of the escaped atoms in evaporative cooling, thereby increasing the condensate output by several orders of magnitude. Condensate atoms are stored in a shepherd trap, protected from absorbing light, under effectively zero-gravity conditions, and coupled out directly into an optical waveguide. Many experiments and devices may be possible with this cw atom laser.

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Observation of a Feshbach Resonance in Cold Atom Scattering

Cited by 477 publications

References 25 publications

Energetics and structural properties of three-dimensional bosonic clusters near threshold

Energetics and structural properties of three-dimensional bosonic clusters near threshold

Correlations in the low-density Fermi gas: Fermi-liquid state, dimerization, and Bardeen-Cooper-Schrieffer pairing

Design for an optical cw atom laser

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