Journal ArticleDOI
Observation of Bose-Einstein Condensation in a Dilute Atomic Vapor
TLDR
A Bose-Einstein condensate was produced in a vapor of rubidium-87 atoms that was confined by magnetic fields and evaporatively cooled and exhibited a nonthermal, anisotropic velocity distribution expected of the minimum-energy quantum state of the magnetic trap in contrast to the isotropic, thermal velocity distribution observed in the broad uncondensed fraction.Abstract:
A Bose-Einstein condensate was produced in a vapor of rubidium-87 atoms that was confined by magnetic fields and evaporatively cooled. The condensate fraction first appeared near a temperature of 170 nanokelvin and a number density of 2.5 x 10 12 per cubic centimeter and could be preserved for more than 15 seconds. Three primary signatures of Bose-Einstein condensation were seen. (i) On top of a broad thermal velocity distribution, a narrow peak appeared that was centered at zero velocity. (ii) The fraction of the atoms that were in this low-velocity peak increased abruptly as the sample temperature was lowered. (iii) The peak exhibited a nonthermal, anisotropic velocity distribution expected of the minimum-energy quantum state of the magnetic trap in contrast to the isotropic, thermal velocity distribution observed in the broad uncondensed fraction.read more
Citations
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Bright solitons from the nonpolynomial Schrödinger equation with inhomogeneous defocusing nonlinearities.
TL;DR: This work studies bright solitons generated by the nonpolynomial self-defocusing (SDF) nonlinearity in the framework of the one-dimensional Muñoz-Mateo-Delgado (MM-D) equation, and produces numerical solutions and analytical ones obtained by means of the Thomas-Fermi approximation.
Journal ArticleDOI
Entangling neutral atoms for quantum information processing
TL;DR: In this article, the authors review recent proposals for performing entanglement manipulation via cold collisions between neutral atoms and discuss possible physical implementations with existing experimental techniques, for example optical lattices and magnetic micro-traps.
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Supersolid Phases of Cold Atom Assemblies
TL;DR: In this article, the low-temperature supersolid "droplet crystal" phase is predicted for a broad class of soft core interactions, and the conditions on the interparticle interaction that render such intriguing phase possible are identified.
Journal ArticleDOI
Computing wave functions of nonlinear Schrodinger equations: A time-independent approach
TL;DR: A novel algorithm for computing the ground-state and excited-state solutions of M-coupled nonlinear Schrodinger equations (MCNLS) has the advantage that it is unnecessary to discretize or integrate the partial derivatives of wave functions.
Journal ArticleDOI
Confined harmonically interacting spin-polarized fermions
TL;DR: In this article, the thermodynamic properties for a three-dimensional model of harmonically interacting spin-polarized fermions in a parabolic potential well are calculated. But the authors only consider the case where the number of particles in the model is fixed.
References
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Proceedings Article
Bose-Einstein condensation in a gas of sodium atoms
TL;DR: The striking signature of Bose condensation was the sudden appearance of a bimodal velocity distribution below the critical temperature of ~2µK.
Journal ArticleDOI
Trapping of neutral sodium atoms with radiation pressure
TL;DR: The confinement and cooling of an optically dense cloud of neutral sodium atoms by radiation pressure was reported, provided by three retroreflected laser beams propagating along orthogonal axes, with a weak magnetic field used to distinguish between the beams.
Journal ArticleDOI
Plancks Gesetz und Lichtquantenhypothese
TL;DR: In this article, the authors describe how the Phasenraum eines Lichtquants in bezug auf ein gegebenes Volumen wird in „Zellen“ von der Grose h3 aufgeteilt, i.e., the Zahl der moglichen Verteilungen der Lichtquanten einer makroskopisch definierten Strahlung unter diese Zellen liefert die Entropie.
Journal ArticleDOI
Observation of atoms laser cooled below the Doppler limit
Paul D. Lett,Richard N. Watts,Christoph I Westbrook,William D. Phillips,Phillip L. Gould,Harold Metcalf +5 more
TL;DR: This "Doppler cooling limit" results from the minimization of the detuning-dependent temperature at low laser power1.
Journal ArticleDOI
Output Coupler for Bose-Einstein Condensed Atoms
TL;DR: In this paper, an output coupler for Bose condensed atoms in a magnetic trap was demonstrated, where short pulses of rf radiation were used to create Bose condensates in a superposition of trapped and untrapped hyperfine states.