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Superfluidity in H2 films

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1997-10
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American Physical Society
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Path integral Monte Carlo calculations were used to study a 2D system of H2 molecules. The ground state on a flat substrate is a triangular lattice, a localized solid. We find that the introduction of some weakly attractive impurities (specifically alkali metal atoms) in the right concentration (~0.01¿¿2) stabilizes a liquid hydrogen phase of concentration 0.04¿¿2 which undergoes a Kosterlitz-Thouless superfluid transition below approximately 1.2 K.
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Physical Review Letters, 1997;79(16):3010-3013
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