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Local Bose condensate: observations on two-dimensional atomic hydrogen |
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| Authors: | S. Jaakkola S. T. Boldarev A. A. Haritonov A. I. Safonov I. I. Lukashevich |
| Affiliation: | a Wihuri Physical Laboratory, Department of Physics, University of Turku, 20014 Turku, Finland b Russian Research Center Kurchatov Institute, LMQS/ISSSP, 123182 Moscow, Russia c P.L. Kapitza Institute for Physical Problems, RAS, 117334 Moscow, Russia |
| Abstract: | We report on new experiments at Turku where two-dimensional atomic hydrogen gas has been compressed magnetically to high degrees of quantum degeneracy on the surface of liquid 4He at about 200 mK. The results are in good agreement with our earlier observations: The probability of 3-body dipolar recombination is found to decrease gradually by an order of magnitude but to show no levelling yet, when the 2D phase-space density increases from 3 to 9. This effect is attributed mainly to a decrease in the local 3-particle correlator caused by the appearance and growth of a more or less local 2D condensate. The roles of interactions and out-of-plane delocalization of adsorbed H atoms are also discussed. |
| Keywords: | 2D bosons Bose–Einstein condensation Hydrogen Spin-polarized hydrogen |
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