Journal ArticleDOI
Observation of Bose-Einstein Condensation in a Dilute Atomic Vapor
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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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Journal ArticleDOI
Optically trapped atom interferometry using the clock transition of large 87 Rb Bose-Einstein condensates
P. A. Altin,Gordon McDonald,D. Döring,John Debs,T. H. Barter,John Close,Nicholas Robins,Simon A. Haine,Thomas M. Hanna,R. P. Anderson +9 more
TL;DR: In this article, a Ramsey-type atom interferometer operating with an optically trapped sample of 106 Bose-condensed 87Rb atoms is presented, with an eye to the construction of future high precision atomic sensors.
Journal ArticleDOI
Simultaneous Readout of Noncommuting Collective Spin Observables beyond the Standard Quantum Limit.
Philipp Kunkel,Maximilian Prüfer,Stefan Lannig,Rodrigo Rosa-Medina,Alexis Bonnin,Martin Gärttner,Helmut Strobel,Markus K. Oberthaler +7 more
TL;DR: In this article, the information extractable from a single absorption image of a spinor Bose-Einstein condensate was augmented by coupling to initially empty auxiliary hyperfine states.
Journal ArticleDOI
Natural orbitals and Bose-Einstein condensates in traps: A diffusion Monte Carlo analysis
TL;DR: In this paper, the authors investigated the properties of hard core bosons in harmonic traps over a wide range of densities and formulated Bose-Einstein condensation using the OBDM, which is equally valid at low and high densities.
Journal ArticleDOI
Trapping Fermionic 40K and Bosonic 87Rb on a Chip
Seth Aubin,M. Extavour,S. Myrskog,Lindsay LeBlanc,Jérôme Estève,Swati Singh,P. Scrutton,David McKay,R. McKenzie,I. D. Leroux,A. Stummer,Joseph H. Thywissen +11 more
TL;DR: In this article, the loading of a Bose-Fermi mixture into a microfabricated magnetic trap was demonstrated, where the magnetic field minimum formed near these current-carrying wires was used to confine up to 6 × 104 neutral 40K atoms.
Journal ArticleDOI
Extra-heating mechanism in Doppler cooling experiments
TL;DR: In this paper, the authors experimentally and theoretically investigate laser cooling of strontium-88 atoms in one-dimensional optical molasses and find that the measured temperatures are systematically larger than the theoretical predictions.
References
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Bose-Einstein condensation in a gas of sodium atoms
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Journal ArticleDOI
Trapping of neutral sodium atoms with radiation pressure
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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.