1,316 research outputs found
Weakly bound atomic trimers in ultracold traps
The experimental three-atom recombination coefficients of the atomic states
Na, Rb and Rb,
together with the corresponding two-body scattering lengths, allow predictions
of the trimer bound state energies for such systems in a trap. The
recombination parameter is given as a function of the weakly bound trimer
energies, which are in the interval for large
positive scattering lengths, . The contribution of a deep-bound state to our
prediction, in the case of Rb, for a particular trap, is
shown to be relatively small.Comment: 5 pages, 1 figur
Laser nanotraps and nanotweezers for cold atoms: 3D gradient dipole force trap in the vicinity of Scanning Near-field Optical Microscope tip
Using a two-dipole model of an optical near-field of Scanning Near-field
Optical Microscope tip, i. e. taking into account contributions of magnetic and
electric dipoles, we propose and analyze a new type of 3D optical nanotrap
found for certain relations between electric and magnetic dipoles. Electric
field attains a minimum value in vacuum in the vicinity of the tip and hence
such a trap is quite suitable for manipulations with cold atoms.Comment: 9 pages, 6 figure
Liberating Efimov physics from three dimensions
When two particles attract via a resonant short-range interaction, three
particles always form an infinite tower of bound states characterized by a
discrete scaling symmetry. It has been considered that this Efimov effect
exists only in three dimensions. Here we review how the Efimov physics can be
liberated from three dimensions by considering two-body and three-body
interactions in mixed dimensions and four-body interaction in one dimension. In
such new systems, intriguing phenomena appear, such as confinement-induced
Efimov effect, Bose-Fermi crossover in Efimov spectrum, and formation of
interlayer Efimov trimers. Some of them are observable in ultracold atom
experiments and we believe that this study significantly broadens our horizons
of universal Efimov physics.Comment: 17 pages, 5 figures, contribution to a special issue of Few-Body
Systems devoted to Efimov Physic
Enriquecimiento cognoscitivo: el hombre visto como sistema abierto
Texto sobre las aportaciones y los beneficios de la perspectiva psicológica del enriquecimiento cognoscitivo para la intervención educativa y terapéutica con personas que demuestran desempeño retardado y otros tipos de desviación emocional o conductual. Se incluye también texto sobre el Primer Coloquio Internacional de Psicología Comunitaria y la Décima Semana de Psicología en el ITESO
Scaling limit of virtual states of triatomic systems
For a system with three identical atoms, the dependence of the wave
virtual state energy on the weakly bound dimer and trimer binding energies is
calculated in a form of a universal scaling function. The scaling function is
obtained from a renormalizable three-body model with a pairwise Dirac-delta
interaction. It was also discussed the threshold condition for the appearance
of the trimer virtual state.Comment: 9 pages, 3 figure
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