Thermal Compression of Atomic Hydrogen on Helium Surface |
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Authors: | J Järvinen J Ahokas S Vasiliev |
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Affiliation: | (1) Wihuri physical laboratory, Department of Physics, University of Turku, 20014 Turku, Finland |
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Abstract: | We describe experiments with spin-polarized atomic hydrogen gas adsorbed on liquid 4He surface. The surface gas density is increased locally by thermal compression up to 5.5 × 1012 cm−2 at 110 mK. This corresponds to the onset of quantum degeneracy with the thermal de-Broglie wavelength being 1.5 times larger
than the mean interatomic spacing. The atoms were detected directly with a 129 GHz electron-spin resonance spectrometer probing
both the surface and the bulk gas. This and the simultaneous measurement of the recombination power, allowed us to make accurate
studies of the adsorption isotherm and the heat removal from the adsorbed hydrogen gas. From the data, we estimate the thermal
contact between 2D hydrogen gas and phonons of the helium film. We analyze the limitations of the thermal compression method
and the possibility to reach the superfluid transition in 2D hydrogen gas. |
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Keywords: | adsorption isotherm atomic hydrogen Berezinski-Kozterlitz-Thouless transition low dimensional gas ripplon-phonon thermal contact |
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